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Step by step example of solving a sudoku puzzle
Step 13   Let’s look at the top right box (where ABC cross PQR). According to sudoku game rules, we can’t put 8s in cells AQ and CP because there are 8s in cell DQ and IP respectively. Therefore, the only available cell is AR.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6   1
1 9 7
4   6
     
3   Step13: 8
1 5 2
  9 7
2 6  
1 5  
     
7   9
  2  
5   4
  8  
9 3  
2 7  
    5
    8
  1 6
     
3 4  
9 7  
    9
     
8   3



   
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