9
4
5
6
7
8
7
4
9
8
3
4
9
7
1
6
5
3
5
2
6
2
7
3
Time 00:00
Mistakes 0
Ready
Expert Sudoku #145
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 24 of 81 |
| Technique score | 23.8 |
| Rated techniques | 3 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 1, 7 can only go in one cell, so it must go there.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.