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Step by step example of solving a sudoku puzzle
Step 47   Let’s look at the bottom right box (where GHI cross PQR). We can’t put a 4 in cell HQ because there’s a 4 in cell HN. We can’t put a 4 in cell IQ because there’s a 4 in cell IJ. Therefore, the only allowed sudoku move is to place the number 4 in cell GQ.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
7 3 9
6 8 1
1 9 7
4 8 6
2 5 3
3 6 8
1 5 2
4 9 7
2 6 4
1 5 7
8 9 3
7 3 9
6 2 8
5 1 4
5 8 1
9 3 4
2 7 6
3 2 5
9 7 8
4 1 6
8 6  
3 4  
9 7  
7 Step47: 4 9
6   5
8   3



   
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