Sudoku #x18

Sudoku game, level: Expert #18. This Sudoku have 23 given numbers (clues)..
Structure: 8 (1 pcs.), 9 (1 pcs.), 2 (2 pcs.), 7 (3 pcs.), 6 (3 pcs.), 5 (3 pcs.), 1 (3 pcs.), 4 (3 pcs.), 3 (4 pcs.), ∑23.


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