Sudoku #x508

Sudoku game, level: Expert #508. This Sudoku have 28 given numbers (clues)..
Structure: 9 (1 pcs.), 6 (2 pcs.), 5 (2 pcs.), 7 (3 pcs.), 3 (3 pcs.), 8 (4 pcs.), 4 (4 pcs.), 2 (4 pcs.), 1 (5 pcs.), ∑28.


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