Sudoku #x427

Sudoku game, level: Expert #427. This Sudoku have 28 given numbers (clues)..
Structure: 3 (2 pcs.), 5 (2 pcs.), 2 (2 pcs.), 7 (3 pcs.), 6 (3 pcs.), 9 (4 pcs.), 8 (4 pcs.), 4 (4 pcs.), 1 (4 pcs.), ∑28.


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