Sudoku #x297

Sudoku game, level: Expert #297. This Sudoku have 20 given numbers (clues)..
Structure: 4 (1 pcs.), 8 (1 pcs.), 9 (1 pcs.), 5 (2 pcs.), 6 (2 pcs.), 7 (2 pcs.), 3 (3 pcs.), 1 (4 pcs.), 2 (4 pcs.), ∑20.


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9
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5
3
7
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8
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7
3
2
1
6
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