Sudoku #x661

Sudoku game, level: Expert #661. This Sudoku have 31 given numbers (clues)..
Structure: 3 (1 pcs.), 5 (2 pcs.), 2 (3 pcs.), 6 (3 pcs.), 4 (3 pcs.), 9 (4 pcs.), 1 (4 pcs.), 8 (5 pcs.), 7 (6 pcs.), ∑31.


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5
7
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1
9
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7
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6
8
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7
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