Sudoku #x403

Sudoku game, level: Expert #403. This Sudoku have 31 given numbers (clues)..
Structure: 8 (2 pcs.), 9 (2 pcs.), 4 (2 pcs.), 3 (3 pcs.), 7 (3 pcs.), 6 (4 pcs.), 5 (5 pcs.), 2 (5 pcs.), 1 (5 pcs.), ∑31.


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