Very difficult sudoku #3549
| 1 | 7 | |||||||
| 5 | 4 | |||||||
| 4 | 7 | 5 | 6 | 9 | ||||
| 6 | 8 | 3 | 4 | |||||
| 7 | ||||||||
| 4 | 7 | 6 | 5 | |||||
| 6 | 2 | 1 | 9 | |||||
| 4 | 7 | |||||||
| 8 | 1 | 6 |
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