Sudoku #x412

Sudoku game, level: Expert #412. This Sudoku have 21 given numbers (clues)..
Structure: 4 (1 pcs.), 2 (1 pcs.), 9 (2 pcs.), 5 (2 pcs.), 3 (3 pcs.), 8 (3 pcs.), 7 (3 pcs.), 6 (3 pcs.), 1 (3 pcs.), ∑21.


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5
8
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6
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9
6
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3
7
9
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8
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