Very difficult sudoku #1566
| 2 | 1 | 7 | ||||||
| 8 | 2 | |||||||
| 1 | 4 | 5 | 2 | 6 | ||||
| 7 | 5 | 4 | ||||||
| 2 | 1 | 9 | ||||||
| 3 | 1 | 6 | ||||||
| 3 | 5 | 6 | 9 | 2 | ||||
| 5 | 6 | |||||||
| 8 | 6 | 2 |
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