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Step by step example of solving a level 5 (very hard) sudoku puzzle

Step 53   Let’s look at the right upper box of the sudoku table (where ABC cross PQR). We can’t put a 9 in cell CQ because there’s a 9 in cell CJ on the same row. As we already know Sudoku rules specify a strict adherence to no repetition of numbers on the same row. Hence, the number 9 must be in cell BQ. If we have been correct in all of our previous sudoku logic, then we can say this with certainty.

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J K L M N O P Q R
A
B
C
D
E
F
G
H
I
1 8 7
5 4 3
9 2 6
3 4 9
6 2 1
8 7 5
2 5 6
8 Step53: 9 7
1   4
4 9 1
3 7 2
8 6 5
2 6 8
9 5 4
7 1 3
3 7 5
6 1 8
4 2 9
2 1 8
6 3 9
7 5 4
4 9 7
5 8 2
1 3 6
5 6 3
7 4 1
9 8 2



   
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