Sudoku #x573

Sudoku game, level: Expert #573. This Sudoku have 20 given numbers (clues)..
Structure: 9 (0 pcs.), 4 (1 pcs.), 8 (2 pcs.), 7 (2 pcs.), 5 (2 pcs.), 3 (2 pcs.), 2 (3 pcs.), 1 (4 pcs.), 6 (4 pcs.), ∑20.


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DEL  
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6
7
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1
6
6
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7
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2
8
6
1
8
5
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