Sudoku #x670

Sudoku game, level: Expert #670. This Sudoku have 28 given numbers (clues)..
Structure: 5 (1 pcs.), 7 (2 pcs.), 9 (2 pcs.), 2 (3 pcs.), 8 (4 pcs.), 1 (4 pcs.), 3 (4 pcs.), 4 (4 pcs.), 6 (4 pcs.), ∑28.


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