5
4
9
7
1
8
4
6
2
3
9
3
6
4
4
8
2
6
1
3
9
5
7
2
7
Time 00:00
Mistakes 0
Ready
Expert Sudoku #187
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 25 of 81 |
| Technique score | 65.8 |
| Rated techniques | 3 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this column 1, 8 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.