Sudoku #x40

Sudoku game, level: Expert #40. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 4 (2 pcs.), 8 (3 pcs.), 7 (3 pcs.), 5 (3 pcs.), 3 (3 pcs.), 1 (4 pcs.), 6 (4 pcs.), 9 (5 pcs.), ∑28.


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