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Step by step example of solving a sudoku puzzle
Step 21   Let’s look at the top left box (where ABC cross JKL). We can’t put an 8 in cell CL because there’s an 8 in cell HL. We can’t put an 8 in row B because there’s an 8 in cell BN. Sudoku general rules leave us with no choice but cell CK. It’s the only available cell according to sudoku game logic.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
    9
6 Step21: 8 1
1 9 7
4 8 6
2 5 3
3 6 8
1 5 2
4 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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