Very difficult sudoku #3166
| 2 | 9 | 4 | 5 | |||||
| 1 | 9 | 2 | 5 | |||||
| 6 | 3 | 9 | 2 | |||||
| 4 | 7 | 5 | 9 | |||||
| 3 | 2 | 5 | ||||||
| 6 | 3 | 4 | 8 | |||||
| 7 | 4 | |||||||
| 6 | 9 | |||||||
| 2 | 7 | 6 |
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