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Step by step example of solving a sudoku puzzle
Step 8   Let’s look at the bottom right box (where GHI cross PQR). We can’t put 3s in columns P and Q because there are 3s in AP and EQ. We can’t put a 3 in cell HR because there’s a 3 in cell HM. Therefore, the only available cell for this sudoku play is IR.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6   1
  9 7
4   6
     
3    
  5  
  9 7
2 6  
1 5  
     
7   9
  2  
5   4
  8  
9 3  
2 7  
    5
    8
  1  
     
3 4  
9 7  
    9
     
8   Step8: 3



   
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