Solving Sudoku
Input values:
0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 0 6 0 1 0 0
8 9 0 0 1 0 0 2 5
0 0 7 0 2 0 0 0 9
0 1 0 0 0 0 0 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 0 0 0

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 1

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 0 6 0 1 0 0
8 9 0 0 1 0 0 2 5
0 0 7 0 2 0 0 0 9
0 1 0 0 0 0 0 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 0 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 1 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 6 7 0 0
col 3:: 1 0 3 4 5 6 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 6 7 8 0
col 8:: 1 0 3 4 5 0 7 8 0
sqfil 1 for row 2
col 1:: 1 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 6 0 0 0
col 6:: 1 2 3 4 0 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 1 0 3 4 0 0 0 8 0
col 9:: 1 0 3 4 0 6 0 8 0
sqfil 1 for row 3
col 1:: 1 2 0 0 5 6 7 0 0
col 3:: 1 2 3 4 5 6 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 4 0 0 0 0 0
col 7:: 0 0 3 0 5 6 7 0 0
col 9:: 1 0 3 4 0 6 7 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 4:: 0 0 3 0 0 0 7 8 9
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 1:: 1 0 0 0 5 6 0 0 0
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 1:: 0 2 0 0 5 0 7 0 9
col 3:: 0 2 0 4 5 0 0 8 0
col 4:: 0 2 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 2 3 0 5 0 7 8 0
col 7:: 0 2 3 0 5 0 7 8 9
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 7:: 0 2 0 0 5 0 7 8 9
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
213 unplaced numbers in 56 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 1 5 6 7
Row 1 col 2: found 3 4 5 6 7
Row 1 col 3: found 1 3 4 5 6
Row 2 col 1: found 1 2 6
Row 2 col 2: found 2 3 4 6
Row 3 col 1: found 1 2 5 6 7
Row 3 col 3: found 1 2 3 4 5 6
££££££Number 1 found 5 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 4 times
££££££Number 5 found 5 times
££££££Number 6 found 7 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 4 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3 4
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 4 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 6 7 8
Row 1 col 8: found 1 3 4 5 7 8
Row 2 col 7: found 3 6 8
Row 2 col 8: found 1 3 4 8
Row 2 col 9: found 1 3 4 6 8
Row 3 col 7: found 3 5 6 7
Row 3 col 9: found 1 3 4 6 7
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 7 times
££££££Number 4 found 4 times
££££££Number 5 found 3 times
££££££Number 6 found 5 times
££££££Number 7 found 4 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 1: found 1 5 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 1 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 3 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 4: found 3 7 8 9
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 4 times
££££££Number 9 found 1 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 7 col 1: found 2 5 7 9
Row 7 col 3: found 2 4 5 8
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 7 times
££££££Number 3 found 0 times
££££££Number 4 found 1 times
££££££Number 5 found 7 times
££££££Number 6 found 2 times
££££££Number 7 found 4 times
££££££Number 8 found 3 times
££££££Number 9 found 1 times
££Octant 8
Row 7 col 4: found 2 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 2 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 7: found 2 3 5 7 8 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 7: found 2 5 7 8 9
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 7 times
££££££Number 8 found 7 times
££££££Number 9 found 2 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6
££ Number 1 placed in row 6 col 1
££ Number 9 placed in row 4 col 4

Looking at octants 7, 8, 9
££ Number 4 placed in row 7 col 3

THREE columns at a time

Looking at octants 1, 4, 7
number 9 placed in row 7 col 1

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9
number 9 placed in row 9 col 7

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 1

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 0 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

6 Single pairs found

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
£££££Only three number 4 found in rows 2 and 5 and 8
2 numbers found in three columns
First row: no = 1 in cols 3 4 8
Next row: no = 4 in cols 2 5 8
Row 2
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 1 and 2 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 1 2 6
Row 3
£££££Only three number 4 found in rows 5 and 6 and 9
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 7 found in rows 1 and 7 and 9
3 numbers found in three columns
First row: no = 4 in cols 5 6 9
Next row: no = 5 in cols 1 3 7
Next row: no = 7 in cols 1 7 9
First row: no = 5 in cols 1 3 7
Next row: no = 7 in cols 1 7 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 2 found in rows 4 and 6 and 7
£££££Only three number 5 found in rows 5 and 6 and 7
2 numbers found in three columns
First row: no = 2 in cols 4 6 7
Next row: no = 5 in cols 5 6 7
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 2 found in rows 3 and 7 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
3 triples found
First col no = 1 in rows 1 3 8
Next col no = 2 in rows 3 7 8
Next col no = 7 in rows 5 7 8
First col no = 2 in rows 3 7 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
1 triples found
Col 7
£££££Only three number 5 found in rows 1 and 3 and 7
1 triples found
Col 8
£££££Only three number 4 found in rows 1 and 2 and 6
£££££Only three number 5 found in rows 1 and 8 and 9
2 triples found
First col no = 4 in rows 1 2 6
Next col no = 5 in rows 1 8 9
Col 9
0 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
2 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
1 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
1 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
1 pairs found

Octant 9
0 pairs found

X-Wing check - rows
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 6 found in row 9 in cols 2 and 3
8 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
9 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
£££Swordfish found - number 4
Cols are 2, 5 and 9
Rows are 1, 2 and 3
End of Swordfish check

LATEST values after iteration 1

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 0 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 5 iteration 1

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 2

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 0 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 2 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 2 3 0 5 0 7 8 0
col 7:: 0 2 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
170 unplaced numbers in 51 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 2 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 2 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 7: found 2 3 5 7 8
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 1 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 0 times
££££££Number 7 found 6 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9
number 2 placed in row 7 col 7

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 2

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 2

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 1 iteration 2

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 3

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 3

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 3

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 3

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 4

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 4

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 4

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 4

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 5

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 5

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 5

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 5

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 6

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 6

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 6

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 6

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 7

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 7

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 7

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 7

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 8

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 8

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 8

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 8

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 9

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 9

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 9

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 9
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in squares

Trial and Error
Row 2 col 1 may be 2 or 6
Row 2 col 7 may be 3 or 8
Row 2 col 9 may be 4 or 6
Row 3 col 5 may be 3 or 4
Row 3 col 9 may be 4 or 6
Row 5 col 3 may be 3 or 6
Row 5 col 4 may be 3 or 7
Row 6 col 4 may be 3 or 8
Row 9 col 5 may be 5 or 8
3 and 8 found in row 2 col 7 and row 6 col 4
No matching pairs
4 and 6 found in row 2 col 9 and row 3 col 9
Pair found! in col 9
End of Trial and Error

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 1

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 1

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 1

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 1

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 2

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 2

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 2

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 2

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 3

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 3

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 3

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 3

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 4

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 4

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 4

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 4

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 5

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 5

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 5

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 5

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 6

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 6

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 6

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 6

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 7

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 7

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 7

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 7

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 8

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 8

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 8

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 8

Establish possible numbers
End of establish possible numbers

Check for single sqfil numbers in a square
End of check single numbers

CHECK 1 for single missing endvalue number - rows

CHECK 1 for single missing endvalue number - cols

CHECK 1 for single missing endvalue number - octants


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9


Check 2 - ROWS
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
ROW 8
ROW 9

LATEST values after iteration 9

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

Error check 4 - rows

Error check 4 - cols
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in 50 squares

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9

Check 2 - COLUMNS
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
COLUMN 5
COLUMN 6
COLUMN 7
COLUMN 8
COLUMN 9
££Found two matching pairs! 4 and 6 in row 2 col 9 and row 3 col 9

Remove possibilities from rows and columns

Remove possibilities from octants
££Octant 1
Row 1 col 1: found 5 6 7
Row 1 col 2: found 3 4 5 7
Row 1 col 3: found 1 3 5
Row 2 col 1: found 2 6
Row 2 col 2: found 2 3 4
Row 3 col 1: found 2 5 6 7
Row 3 col 3: found 1 2 3 5
££££££Number 1 found 2 times
££££££Number 2 found 4 times
££££££Number 3 found 4 times
££££££Number 4 found 2 times
££££££Number 5 found 5 times
££££££Number 6 found 3 times
££££££Number 7 found 3 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 2
Row 1 col 4: found 1 3 6 8
Row 1 col 5: found 3 4 8
Row 2 col 6: found 1 2 3 8
Row 3 col 4: found 1 2 3 6
Row 3 col 5: found 3 4
Row 3 col 6: found 1 2 3
££££££Number 1 found 4 times
££££££Number 2 found 3 times
££££££Number 3 found 6 times
££££££Number 4 found 2 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 3
Row 1 col 7: found 3 5 7 8
Row 1 col 8: found 1 3 5 7 8
Row 2 col 7: found 3 8
Row 2 col 8: found 1 3 8
Row 2 col 9: found 4 6
Row 3 col 7: found 3 5 7
Row 3 col 9: found 4 6
££££££Number 1 found 2 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 4
Row 4 col 2: found 2 3 5
Row 4 col 3: found 2 3 5
Row 5 col 3: found 3 6
Row 6 col 2: found 3 5 6
££££££Number 1 found 0 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 3 times
££££££Number 6 found 2 times
££££££Number 7 found 0 times
££££££Number 8 found 0 times
££££££Number 9 found 0 times
££Octant 5
Row 4 col 6: found 3 5 7 8
Row 5 col 4: found 3 7
Row 5 col 6: found 3 4 7
Row 6 col 4: found 3 8
Row 6 col 6: found 3 4 5 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 2 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 3 times
££££££Number 8 found 3 times
££££££Number 9 found 0 times
££Octant 6
Row 4 col 8: found 3 7 8
Row 4 col 9: found 3 7 8
Row 5 col 7: found 3 6 7
Row 6 col 7: found 3 6 8
Row 6 col 8: found 3 4 8
££££££Number 1 found 0 times
££££££Number 2 found 0 times
££££££Number 3 found 5 times
££££££Number 4 found 1 times
££££££Number 5 found 0 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 4 times
££££££Number 9 found 0 times
££Octant 7
Row 8 col 1: found 2 5 7
Row 8 col 2: found 2 5 7
Row 8 col 3: found 2 5 8
Row 9 col 2: found 2 5 6 7
Row 9 col 3: found 2 5 6 8
££££££Number 1 found 0 times
££££££Number 2 found 5 times
££££££Number 3 found 0 times
££££££Number 4 found 0 times
££££££Number 5 found 5 times
££££££Number 6 found 2 times
££££££Number 7 found 3 times
££££££Number 8 found 2 times
££££££Number 9 found 0 times
££Octant 8
Row 7 col 4: found 3 7 8
Row 7 col 5: found 3 5 8
Row 7 col 6: found 3 5 7 8
Row 8 col 4: found 1 2 3 7 8
Row 9 col 5: found 5 8
Row 9 col 6: found 1 2 5 7 8
££££££Number 1 found 2 times
££££££Number 2 found 2 times
££££££Number 3 found 4 times
££££££Number 4 found 0 times
££££££Number 5 found 4 times
££££££Number 6 found 0 times
££££££Number 7 found 4 times
££££££Number 8 found 6 times
££££££Number 9 found 0 times
££Octant 9
Row 7 col 9: found 3 7 8
Row 8 col 8: found 1 3 5 7 8
Row 8 col 9: found 1 3 7 8
Row 9 col 8: found 1 5 7 8
Row 9 col 9: found 1 7 8
££££££Number 1 found 4 times
££££££Number 2 found 0 times
££££££Number 3 found 3 times
££££££Number 4 found 0 times
££££££Number 5 found 2 times
££££££Number 6 found 0 times
££££££Number 7 found 5 times
££££££Number 8 found 5 times
££££££Number 9 found 0 times

££End of octants

OCTANT by OCTANT
Octant 1
Octant 2
Octant 3
Octant 4
Octant 5
Octant 6
Octant 7
Octant 8
Octant 9

THREE rows at a time

Looking at octants 1, 2, 3

Looking at octants 4, 5, 6

Looking at octants 7, 8, 9

THREE columns at a time

Looking at octants 1, 4, 7

Looking at octants 2, 5, 8

Looking at octants 3, 6, 9

Error check 1 - rows

Error check 1 - cols

LATEST values after iteration 9

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

9 Single pairs found

NNaked pairs!
Nos 4 and 6 found in row 2 col 9 and row 3 col 9

Naked pairs in octants

Octant 1

Octant 2

Octant 3

Octant 4

Octant 5
Found 3 and 7 in row 5 col 4
and 3 and 8 in row 6 col 4

Octant 6

Octant 7

Octant 8

Octant 9

Naked triples - first, rows
Row 1
£££££Only three number 1 found in rows 3 and 4 and 8
1 numbers found in three columns
Row 2
£££££Only three number 2 found in rows 1 and 2 and 6
£££££Only three number 8 found in rows 6 and 7 and 8
2 numbers found in three columns
First row: no = 2 in cols 1 2 6
Next row: no = 8 in cols 6 7 8
Row 3
£££££Only three number 1 found in rows 3 and 4 and 6
£££££Only three number 5 found in rows 1 and 3 and 7
£££££Only three number 6 found in rows 1 and 4 and 9
3 numbers found in three columns
First row: no = 1 in cols 3 4 6
Next row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
First row: no = 5 in cols 1 3 7
Next row: no = 6 in cols 1 4 9
Row 4
£££££Only three number 5 found in rows 2 and 3 and 6
£££££Only three number 7 found in rows 6 and 8 and 9
£££££Only three number 8 found in rows 6 and 8 and 9
3 numbers found in three columns
First row: no = 5 in cols 2 3 6
Next row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
First row: no = 7 in cols 6 8 9
Next row: no = 8 in cols 6 8 9
Found two the same - nos. 7 and 8 in cols 6 and 8 and 9
Row 5
£££££Only three number 7 found in rows 4 and 6 and 7
1 numbers found in three columns
Row 6
0 numbers found in three columns
Row 7
£££££Only three number 7 found in rows 4 and 6 and 9
1 numbers found in three columns
Row 8
£££££Only three number 1 found in rows 4 and 8 and 9
£££££Only three number 3 found in rows 4 and 8 and 9
2 numbers found in three columns
First row: no = 1 in cols 4 8 9
Next row: no = 3 in cols 4 8 9
Found two the same - nos. 1 and 3 in cols 4 and 8 and 9
Row 9
£££££Only three number 1 found in rows 6 and 8 and 9
£££££Only three number 2 found in rows 2 and 3 and 6
2 numbers found in three columns
First row: no = 1 in cols 6 8 9
Next row: no = 2 in cols 2 3 6
End of naked triples rows

Naked triples - second, cols
Col 1
£££££Only three number 2 found in rows 2 and 3 and 8
£££££Only three number 5 found in rows 1 and 3 and 8
£££££Only three number 6 found in rows 1 and 2 and 3
£££££Only three number 7 found in rows 1 and 3 and 8
4 triples found
First col no = 2 in rows 2 3 8
Next col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
First col no = 5 in rows 1 3 8
Next col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Found two the same - nos. 5 and 7 in rows 1 and 3 and 8
First col no = 6 in rows 1 2 3
Next col no = 7 in rows 1 3 8
Col 2
£££££Only three number 7 found in rows 1 and 8 and 9
1 triples found
Col 3
0 triples found
Col 4
£££££Only three number 1 found in rows 1 and 3 and 8
£££££Only three number 7 found in rows 5 and 7 and 8
2 triples found
First col no = 1 in rows 1 3 8
Next col no = 7 in rows 5 7 8
Col 5
£££££Only three number 3 found in rows 1 and 3 and 7
£££££Only three number 8 found in rows 1 and 7 and 9
2 triples found
First col no = 3 in rows 1 3 7
Next col no = 8 in rows 1 7 9
Col 6
£££££Only three number 1 found in rows 2 and 3 and 9
£££££Only three number 2 found in rows 2 and 3 and 9
2 triples found
First col no = 1 in rows 2 3 9
Next col no = 2 in rows 2 3 9
Found two the same - nos. 1 and 2 in rows 2 and 3 and 9
Col 7
£££££Only three number 7 found in rows 1 and 3 and 5
£££££Only three number 8 found in rows 1 and 2 and 6
2 triples found
First col no = 7 in rows 1 3 5
Next col no = 8 in rows 1 2 6
Col 8
£££££Only three number 5 found in rows 1 and 8 and 9
1 triples found
Col 9
£££££Only three number 3 found in rows 4 and 7 and 8
1 triples found
End of naked triples cols

Hidden pairs - first, rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
1 pairs found

Hidden pairs - second, cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
3 pairs found
Found hidden pair no. 4 and 6
in col 9 in rows 2 and 3

Hidden pairs - third, octants

Octant 1
£££££Only two number 1 found in row 1 col 3 and row 3 col 3
£££££Only two number 4 found in row 1 col 2 and row 2 col 2
2 pairs found

Octant 2
£££££Only two number 4 found in row 1 col 5 and row 3 col 5
£££££Only two number 6 found in row 1 col 4 and row 3 col 4
2 pairs found

Octant 3
£££££Only two number 1 found in row 1 col 8 and row 2 col 8
£££££Only two number 4 found in row 2 col 9 and row 3 col 9
£££££Only two number 6 found in row 2 col 9 and row 3 col 9
3 pairs found

Octant 4
£££££Only two number 2 found in row 4 col 2 and row 4 col 3
£££££Only two number 6 found in row 5 col 3 and row 6 col 2
2 pairs found

Octant 5
£££££Only two number 4 found in row 5 col 6 and row 6 col 6
£££££Only two number 5 found in row 4 col 6 and row 6 col 6
2 pairs found

Octant 6
£££££Only two number 6 found in row 5 col 7 and row 6 col 7
1 pairs found

Octant 7
£££££Only two number 6 found in row 9 col 2 and row 9 col 3
£££££Only two number 8 found in row 8 col 3 and row 9 col 3
2 pairs found

Octant 8
£££££Only two number 1 found in row 8 col 4 and row 9 col 6
£££££Only two number 2 found in row 8 col 4 and row 9 col 6
2 pairs found

Octant 9
£££££Only two number 5 found in row 8 col 8 and row 9 col 8
1 pairs found

X-Wing check - rows
£££££Only two number 4 found in row 1 in cols 2 and 5
£££££Only two number 6 found in row 1 in cols 1 and 4
£££££Only two number 1 found in row 2 in cols 6 and 8
£££££Only two number 4 found in row 2 in cols 2 and 9
£££££Only two number 6 found in row 2 in cols 1 and 9
£££££Only two number 4 found in row 3 in cols 5 and 9
£££££Only two number 7 found in row 3 in cols 1 and 7
£££££Only two number 2 found in row 4 in cols 2 and 3
£££££Only two number 6 found in row 5 in cols 3 and 7
£££££Only two number 4 found in row 6 in cols 6 and 8
£££££Only two number 5 found in row 6 in cols 2 and 6
£££££Only two number 6 found in row 6 in cols 2 and 7
£££££Only two number 5 found in row 7 in cols 5 and 6
£££££Only two number 6 found in row 9 in cols 2 and 3
14 pairs found

X-Wing check - cols
£££££Only two number 4 found in col 2 in rows 1 and 2
£££££Only two number 6 found in col 2 in rows 6 and 9
£££££Only two number 1 found in col 3 in rows 1 and 3
£££££Only two number 6 found in col 3 in rows 5 and 9
£££££Only two number 8 found in col 3 in rows 8 and 9
£££££Only two number 2 found in col 4 in rows 3 and 8
£££££Only two number 6 found in col 4 in rows 1 and 3
£££££Only two number 4 found in col 5 in rows 1 and 3
£££££Only two number 5 found in col 5 in rows 7 and 9
£££££Only two number 4 found in col 6 in rows 5 and 6
£££££Only two number 5 found in col 7 in rows 1 and 3
£££££Only two number 6 found in col 7 in rows 5 and 6
£££££Only two number 1 found in col 9 in rows 8 and 9
£££££Only two number 4 found in col 9 in rows 2 and 3
£££££Only two number 6 found in col 9 in rows 2 and 3
15 pairs found
End of X-wing checks

Swordfish check - first, rows
£££Swordfish found - number 6
Rows are 5, 6 and 9
Cols are 2, 3 and 7

Swordfish check - cols
End of Swordfish check

LATEST values after iteration 9

0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0

total new numbers placed in this pass = 0 iteration 9
sqfil 1 for row 1
col 1:: 0 0 0 0 5 6 7 0 0
col 2:: 0 0 3 4 5 0 7 0 0
col 3:: 1 0 3 0 5 0 0 0 0
col 4:: 1 0 3 0 0 6 0 8 0
col 5:: 0 0 3 4 0 0 0 8 0
col 7:: 0 0 3 0 5 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
sqfil 1 for row 2
col 1:: 0 2 0 0 0 6 0 0 0
col 2:: 0 2 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 8 0
col 7:: 0 0 3 0 0 0 0 8 0
col 8:: 1 0 3 0 0 0 0 8 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 3
col 1:: 0 2 0 0 5 6 7 0 0
col 3:: 1 2 3 0 5 0 0 0 0
col 4:: 1 2 3 0 0 6 0 0 0
col 5:: 0 0 3 4 0 0 0 0 0
col 6:: 1 2 3 0 0 0 0 0 0
col 7:: 0 0 3 0 5 0 7 0 0
col 9:: 0 0 0 4 0 6 0 0 0
sqfil 1 for row 4
col 2:: 0 2 3 0 5 0 0 0 0
col 3:: 0 2 3 0 5 0 0 0 0
col 6:: 0 0 3 0 5 0 7 8 0
col 8:: 0 0 3 0 0 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 5
col 3:: 0 0 3 0 0 6 0 0 0
col 4:: 0 0 3 0 0 0 7 0 0
col 6:: 0 0 3 4 0 0 7 0 0
col 7:: 0 0 3 0 0 6 7 0 0
sqfil 1 for row 6
col 2:: 0 0 3 0 5 6 0 0 0
col 4:: 0 0 3 0 0 0 0 8 0
col 6:: 0 0 3 4 5 0 0 8 0
col 7:: 0 0 3 0 0 6 0 8 0
col 8:: 0 0 3 4 0 0 0 8 0
sqfil 1 for row 7
col 4:: 0 0 3 0 0 0 7 8 0
col 5:: 0 0 3 0 5 0 0 8 0
col 6:: 0 0 3 0 5 0 7 8 0
col 9:: 0 0 3 0 0 0 7 8 0
sqfil 1 for row 8
col 1:: 0 2 0 0 5 0 7 0 0
col 2:: 0 2 0 0 5 0 7 0 0
col 3:: 0 2 0 0 5 0 0 8 0
col 4:: 1 2 3 0 0 0 7 8 0
col 8:: 1 0 3 0 5 0 7 8 0
col 9:: 1 0 3 0 0 0 7 8 0
sqfil 1 for row 9
col 2:: 0 2 0 0 5 6 7 0 0
col 3:: 0 2 0 0 5 6 0 8 0
col 5:: 0 0 0 0 5 0 0 8 0
col 6:: 1 2 0 0 5 0 7 8 0
col 8:: 1 0 0 0 5 0 7 8 0
col 9:: 1 0 0 0 0 0 7 8 0
163 unplaced numbers in squares

Trial and Error
Row 2 col 1 may be 2 or 6
Row 2 col 7 may be 3 or 8
Row 2 col 9 may be 4 or 6
Row 3 col 5 may be 3 or 4
Row 3 col 9 may be 4 or 6
Row 5 col 3 may be 3 or 6
Row 5 col 4 may be 3 or 7
Row 6 col 4 may be 3 or 8
Row 9 col 5 may be 5 or 8
3 and 8 found in row 2 col 7 and row 6 col 4
No matching pairs
4 and 6 found in row 2 col 9 and row 3 col 9
Pair found! in col 9
End of Trial and Error
0 0 0 0 0 9 0 0 2
0 0 9 5 7 0 0 0 0
0 8 0 0 0 0 0 9 0
4 0 0 9 6 0 1 0 0
8 9 0 0 1 0 0 2 5
1 0 7 0 2 0 0 0 9
9 1 4 0 0 0 2 6 0
0 0 0 0 9 6 4 0 0
3 0 0 4 0 0 9 0 0