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Sample Solution
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# Sample Solution [pySudokuSolver 1.3]
# Author: पुष्पक दगड़े (Pushpak Dagade)
# Email: guanidene@gmail.com
This is the solution generated by pySudokuSolver 1.3 for the puzzle shown below,
which is one of the toughest puzzle I have found till date.
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . . . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 . | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
=========================
[Max Assumptions: 4]
Solving exactly...
(2,5) --> 5
(5,6) --> 3
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
(New Assumption Level.
Assumption Tree: [1]
Saving puzzle...)
Assuming 5 in cell (6,2)
[Other can be 9]
Solving exactly...
(5,8) --> 5
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
5 in (6,2)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 9 in cell (6,2)
[Other can be 5]
Solving exactly...
(8,1) --> 9
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
9 in (6,2)
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 1 in cell (7,8)
[Other can be 4]
Solving exactly...
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . 1 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
1 in (7,8)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 4 in cell (7,8)
[Other can be 1]
Solving exactly...
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . 4 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
4 in (7,8)
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Didn't get anything from
this Assumption Level.
Assumption Tree: [1]
Puzzle complete?
> Not yet!
(New Assumption Level.
Assumption Tree: [2]
Saving puzzle...)
Assuming 5 in cell (6,2)
[Other can be 9]
(Entering into nested
assumption...)
Solving exactly...
(5,8) --> 5
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
(New Assumption Level.
Assumption Tree: [2, 1]
Saving puzzle...)
Assuming 2 in cell (5,1)
[Other can be 9]
Solving exactly...
(4,9) --> 2
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . 2 |
| 2 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
2 in (5,1)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 9 in cell (5,1)
[Other can be 2]
Solving exactly...
(8,2) --> 9
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| 9 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . 9 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
9 in (5,1)
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 1 in cell (7,8)
[Other can be 4]
Solving exactly...
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . 1 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
1 in (7,8)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 4 in cell (7,8)
[Other can be 1]
Solving exactly...
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . 4 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
4 in (7,8)
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . 5 6 |
| . 5 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Didn't get anything from
this Assumption Level.
Assumption Tree: [2, 1]
(Exiting from nested
assumption...)
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
5 in (6,2)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . . 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| . . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 9 in cell (6,2)
[Other can be 5]
(Entering into nested
assumption...)
Solving exactly...
(8,1) --> 9
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| 8 . . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . . |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
(New Assumption Level.
Assumption Tree: [2, 1]
Saving puzzle...)
Assuming 2 in cell (1,2)
[Other can be 4]
Solving exactly...
(4,2) --> 8
(5,3) --> 2
(8,2) --> 5
(9,2) --> 3
(2,2) --> 4
(5,1) --> 5
(2,9) --> 3
(3,6) --> 2
(3,1) --> 3
(4,9) --> 2
(5,4) --> 8
(6,9) --> 5
(6,1) --> 7
(7,5) --> 3
(9,8) --> 5
(4,3) --> 6
(4,5) --> 9
(3,3) --> 9
(4,4) --> 1
(4,8) --> 7
(2,3) --> 1
(9,3) --> 8
(1,1) --> 6
(7,3) --> 7
(3,9) --> 8
(6,7) --> 1
(8,9) --> 1
(9,9) --> 4
(1,9) --> 7
(9,4) --> 6
(9,5) --> 2
(3,4) --> 4
(3,8) --> 6
(8,4) --> 7
(8,5) --> 8
(9,1) --> 1
(1,6) --> 8
(2,4) --> 9
(7,1) --> 2
(7,7) --> 8
(1,8) --> 1
(1,7) --> 4
(2,6) --> 6
(5,8) --> 4
(5,7) --> 9
(6,5) --> 6
(7,6) --> 1
(8,7) --> 2
(6,6) --> 4
+-------+-------+-------+
| 6 2 5 | 3 . 8 | 4 1 7 |
| 8 4 1 | 9 5 6 | . 2 3 |
| 3 7 9 | 4 1 2 | 5 6 8 |
+-------+-------+-------+
| 4 8 6 | 1 9 5 | 3 7 2 |
| 5 1 2 | 8 7 3 | 9 4 6 |
| 7 9 3 | 2 6 4 | 1 8 5 |
+-------+-------+-------+
| 2 6 7 | 5 3 1 | 8 . 9 |
| 9 5 4 | 7 8 . | 2 3 1 |
| 1 3 8 | 6 2 9 | 7 5 4 |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Definately incorrect!
[2 in cell (1,2)]
Hence, defintely correct-
[4 in cell (1,2)]
Solving exactly...
(2,2) --> 3
(3,9) --> 3
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
(New Assumption Level.
Assumption Tree: [2, 1]
Saving puzzle...)
Assuming 2 in cell (3,1)
[Other can be 6]
Solving exactly...
(5,1) --> 5
(6,9) --> 5
(6,1) --> 7
(8,2) --> 5
(9,8) --> 5
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| 2 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| 5 1 . | . 7 3 | . . 6 |
| 7 9 3 | 2 . . | . 8 5 |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 5 4 | . . . | . 3 . |
| . . . | . . 9 | 7 5 . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
2 in (3,1)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 6 in cell (3,1)
[Other can be 2]
Solving exactly...
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| 6 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
6 in (3,1)
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 2 in cell (4,2)
[Other can be 8]
Solving exactly...
(5,1) --> 5
(5,3) --> 8
(5,7) --> 2
(6,9) --> 5
(6,1) --> 7
(8,2) --> 5
(9,8) --> 5
(4,3) --> 6
(9,2) --> 8
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 2 6 | . . 5 | 3 . . |
| 5 1 8 | . 7 3 | 2 . 6 |
| 7 9 3 | 2 . . | . 8 5 |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 5 4 | . . . | . 3 . |
| . 8 . | . . 9 | 7 5 . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
2 in (4,2)
Saving the above puzzle.
Will be useful if other
assumption (on same cell)
is definitely incorrect.
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 8 in cell (4,2)
[Other can be 2]
Solving exactly...
(5,3) --> 2
(5,1) --> 5
(4,9) --> 2
(5,4) --> 8
(6,9) --> 5
(6,1) --> 7
(8,2) --> 5
(9,8) --> 5
(4,3) --> 6
(4,5) --> 9
(9,2) --> 2
(3,3) --> 9
(4,4) --> 1
(4,8) --> 7
(2,3) --> 1
(9,3) --> 8
(7,3) --> 7
(3,6) --> 8
(6,7) --> 1
(3,1) --> 2
(1,1) --> 6
(1,5) --> 2
(1,6) --> 7
(2,9) --> 7
(8,4) --> 7
+-------+-------+-------+
| 6 4 5 | 3 2 7 | . . . |
| 8 3 1 | . 5 . | . 2 7 |
| 2 7 9 | . 1 8 | 5 . 3 |
+-------+-------+-------+
| 4 8 6 | 1 9 5 | 3 7 2 |
| 5 1 2 | 8 7 3 | . . 6 |
| 7 9 3 | 2 . . | 1 8 5 |
+-------+-------+-------+
| . 6 7 | 5 . . | . . 9 |
| 9 5 4 | 7 . . | . 3 . |
| . 2 8 | . . 9 | 7 5 . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
8 in (4,2)
Reverting to this puzzle
(saved at the beginning
of this assumption) -
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| . 1 . | . 7 3 | . . 6 |
| . 9 3 | 2 . . | . 8 . |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 . 4 | . . . | . 3 . |
| . . . | . . 9 | 7 . . |
+-------+-------+-------+
Assuming 2 in cell (5,1)
[Other can be 5]
Solving exactly...
(3,1) --> 6
(4,2) --> 8
(1,1) --> 1
(2,3) --> 9
(3,3) --> 2
(4,9) --> 2
(5,8) --> 5
(5,4) --> 8
(5,7) --> 9
(6,1) --> 5
(6,9) --> 7
(1,9) --> 8
(4,8) --> 1
(6,7) --> 4
(7,8) --> 4
(9,1) --> 3
(9,8) --> 6
(1,7) --> 6
(2,7) --> 1
(2,9) --> 4
(3,8) --> 9
(6,5) --> 6
(6,6) --> 1
(7,1) --> 7
(1,8) --> 7
(3,4) --> 4
(3,6) --> 8
(4,4) --> 9
(7,6) --> 2
(7,7) --> 8
(8,5) --> 8
(8,7) --> 2
(9,4) --> 1
(9,5) --> 4
(9,9) --> 5
(7,3) --> 1
(7,5) --> 3
(8,2) --> 5
(8,9) --> 1
(9,2) --> 2
(9,3) --> 8
(1,5) --> 2
(4,3) --> 6
+-------+-------+-------+
| 1 4 5 | 3 2 . | 6 7 8 |
| 8 3 9 | . 5 . | 1 2 4 |
| 6 7 2 | 4 1 8 | 5 9 3 |
+-------+-------+-------+
| 4 8 6 | 9 . 5 | 3 1 2 |
| 2 1 . | 8 7 3 | 9 5 6 |
| 5 9 3 | 2 6 1 | 4 8 7 |
+-------+-------+-------+
| 7 6 1 | 5 3 2 | 8 4 9 |
| 9 5 4 | . 8 . | 2 3 1 |
| 3 2 8 | 1 4 9 | 7 6 5 |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Definately incorrect!
[2 in cell (5,1)]
Hence, defintely correct-
[5 in cell (5,1)]
Solving exactly...
(6,9) --> 5
(6,1) --> 7
(8,2) --> 5
(9,8) --> 5
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| . 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| 5 1 . | . 7 3 | . . 6 |
| 7 9 3 | 2 . . | . 8 5 |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 5 4 | . . . | . 3 . |
| . . . | . . 9 | 7 5 . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
(New Assumption Level.
Assumption Tree: [2, 1]
Saving puzzle...)
Assuming 2 in cell (3,1)
[Other can be 6]
Solving exactly...
+-------+-------+-------+
| . 4 5 | 3 . . | . . . |
| 8 3 . | . 5 . | . 2 . |
| 2 7 . | . 1 . | 5 . 3 |
+-------+-------+-------+
| 4 . . | . . 5 | 3 . . |
| 5 1 . | . 7 3 | . . 6 |
| 7 9 3 | 2 . . | . 8 5 |
+-------+-------+-------+
| . 6 . | 5 . . | . . 9 |
| 9 5 4 | . . . | . 3 . |
| . . . | . . 9 | 7 5 . |
+-------+-------+-------+
Puzzle complete?
> Not yet!
Assumption correct?
Maybe. Can't say anything
as of now. Assumption was
2 in (3,1)