7
8
3
1
9
1
5
5
2
7
4
3
1
6
8
2
8
1
2
2
5
3
6
4
7
8
4
7
Time 00:00
Mistakes 0
Ready
Expert Sudoku #57
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 90 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 2 already sees all eight other digits in its row, column and box, so it can only be 1.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.