1 2 0 0 0 0 0 5 0
0 0 4 0 1 8 0 0 0
0 0 0 2 5 6 0 0 1
0 0 3 0 0 4 0 0 7
0 0 0 0 0 0 0 1 5
4 0 0 0 0 1 8 0 0
0 1 0 0 0 0 0 2 0
0 7 0 0 0 3 9 0 0
0 0 0 1 0 0 0 7 8
 
Sudoku insoluble