Sudoku #x781

Sudoku game, level: Expert #781. This Sudoku have 31 given numbers (clues)..
Structure: 8 (1 pcs.), 9 (2 pcs.), 6 (3 pcs.), 7 (3 pcs.), 4 (4 pcs.), 3 (4 pcs.), 1 (4 pcs.), 5 (5 pcs.), 2 (5 pcs.), ∑31.


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9
3
3
7
1
4
5
4
2
2
9
1
7
5
2
4
8
6
1
6
5
2
3
4
5
1
6
7
3
5
2
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