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Step by step example of solving a sudoku puzzle
Step 1   Let's look at the top right end box (where ABC cross PQR). We can't put a 9 in row A (cells AQ and AR) because there's a 9 on cell AN, and can't put a 9 in row B (cells BP and BR) because there's a 9 on cell BL.  We can’t put a 9 in cell CP because there's a 9 on the same line on cell EP. Therefore, according to sudoku rules the only cell available for a 9 is cell CQ.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6    
  9  
4   6
     
3    
  5  
  Step1: 9 7
2 6  
1    
     
7    
  2  
5   4
  8  
9 3  
2    
    5
    8
  1  
     
3 4  
  7  
    9
     
8    

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