3
1
7
2
7
3
5
8
7
3
3
1
4
4
5
8
1
7
8
5
5
2
4
7
5
2
8
9
7
5
Time 00:00
Mistakes 0
Ready
Expert Sudoku #173
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 30 of 81 |
| Technique score | 47.8 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 1, 5 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.