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Step by step example of solving a sudoku puzzle

Step 23   Let’s look at the left middle box (where DEF cross JKL). Another straight forward sudoku logic. We can’t put a 9 in column L because there’s a 9 in cell BL. Therefore, the only available cell is FK.

 
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 Step23: 9  
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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