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Step by step example of solving a sudoku puzzle
Step 28   Let’s look at the bottom right box of the sudoku puzzle (where GHI cross PQR). We can’t put a 7 in column Q because there’s a 7 in cell FQ.  Therefore, the only option we have is cell GP.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
    9
6 8 1
1 9 7
4 8 6
2 5 3
3 6 8
1 5 2
4 9 7
2 6  
1 5  
8 9  
7   9
  2  
5   4
5 8  
9 3  
2 7  
    5
9   8
  1 6
     
3 4  
9 7  
Step28: 7   9
6   5
8   3



   
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