Difficult sudoku #636
| 1 | 2 | |||||||
| 1 | 2 | 3 | ||||||
| 7 | 8 | 2 | 3 | 6 | 5 | |||
| 5 | 1 | |||||||
| 6 | 5 | 8 | 2 | 9 | 7 | |||
| 2 | 9 | |||||||
| 6 | 9 | 3 | 1 | 4 | 2 | |||
| 7 | 4 | 9 | ||||||
| 9 | 7 |
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