Sudoku #x81

Sudoku game, level: Expert #81. This Sudoku have 28 given numbers (clues)..
Structure: 4 (1 pcs.), 9 (2 pcs.), 6 (3 pcs.), 8 (3 pcs.), 5 (3 pcs.), 3 (3 pcs.), 7 (4 pcs.), 1 (4 pcs.), 2 (5 pcs.), ∑28.


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