9
1
3
4
2
8
4
5
2
7
6
5
1
1
5
3
6
8
6
7
3
4
1
2
6
3
9
Time 00:00
Mistakes 0
Ready
Expert Sudoku #215
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 27 of 81 |
| Technique score | 12.4 |
| Rated techniques | 3 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 4, 1 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.