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Step by step example of solving a sudoku puzzle
Step 24   Let’s look at the bottom left box (where GHI cross JKL). We can’t a 9 in column K because there’s a 9 in cell FK. We can’t put a 9 in cell IL because there’s a 9 in cell BL. We can’t put 9s in cells GJ and IJ because there are 9s in cells GR and IM respectively. Therefore, the only available cell is HJ. As you may notice, the rules of sudoku necessitate the player to use consistent logic much like in the game of chess.

 
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
  8  
9 3  
2 7  
    5
Step24: 9   8
  1 6
     
3 4  
9 7  
    9
     
8   3



   
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