Difficult sudoku #1721
| 5 | 4 | 7 | ||||||
| 9 | 7 | 6 | 1 | 8 | ||||
| 3 | 9 | |||||||
| 9 | 4 | 5 | 6 | |||||
| 1 | 5 | 2 | 3 | 4 | ||||
| 6 | 4 | 2 | ||||||
| 6 | 7 | 3 | ||||||
| 5 | ||||||||
| 6 | 3 | 4 |
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