Very difficult sudoku #1520
| 4 | ||||||||
| 6 | 8 | 2 | 4 | |||||
| 2 | 5 | 9 | 1 | |||||
| 7 | 8 | 9 | ||||||
| 8 | 6 | |||||||
| 3 | 7 | 6 | ||||||
| 7 | 9 | 3 | 4 | |||||
| 4 | 5 | 1 | 6 | |||||
| 6 |
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