Sudoku #x571

Sudoku game, level: Expert #571. This Sudoku have 22 given numbers (clues)..
Structure: 7 (1 pcs.), 8 (2 pcs.), 6 (2 pcs.), 5 (2 pcs.), 4 (2 pcs.), 2 (3 pcs.), 3 (3 pcs.), 1 (3 pcs.), 9 (4 pcs.), ∑22.


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