Sudoku #x15

Sudoku game, level: Expert #15. This Sudoku have 28 given numbers (clues)..
Structure: 1 (2 pcs.), 3 (2 pcs.), 4 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 5 (3 pcs.), 2 (4 pcs.), 6 (5 pcs.), 7 (6 pcs.), ∑28.


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