1 2 3 | 4 5 6 | 7 8 9
9 1 2 | 3 4 5 | 6 7 8
8 9 1 | 2 3 4 | 5 6 7
- - - + - - - + - - -
7 8 9 | 1 2 3 | 4 5 6
6 7 8 | 9 1 2 | 3 4 5
5 6 7 | 8 9 1 | 2 3 4
- - - + - - - + - - -
4 5 6 | 7 8 9 | 1 2 3
3 4 5 | 6 7 8 | 9 1 2
2 3 4 | 5 6 7 | 8 9 1
solved Checking Sudoku solution [closed]