Very difficult sudoku #1679
| 7 | 8 | 5 | 1 | |||||
| 6 | 5 | |||||||
| 4 | 5 | 2 | 7 | 9 | 1 | |||
| 9 | 3 | |||||||
| 3 | 9 | 8 | 2 | |||||
| 2 | 4 | 7 | 5 | 1 | 8 | 3 | ||
| 5 | 4 | |||||||
| 9 |
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