Sudoku #x66

Sudoku game, level: Expert #66. This Sudoku have 28 given numbers (clues)..
Structure: 6 (1 pcs.), 5 (2 pcs.), 8 (2 pcs.), 2 (3 pcs.), 4 (3 pcs.), 1 (4 pcs.), 3 (4 pcs.), 9 (4 pcs.), 7 (5 pcs.), ∑28.


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