Sudoku #m72

Sudoku game, level: Medium #72. This Sudoku have 23 given numbers (clues)..
Structure: 3 (1 pcs.), 9 (2 pcs.), 8 (2 pcs.), 5 (2 pcs.), 4 (2 pcs.), 2 (3 pcs.), 7 (3 pcs.), 6 (4 pcs.), 1 (4 pcs.), ∑23.


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