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Step by step example of solving a sudoku puzzle

Step 10   This step is a bit more complicated. This logic makes the sudoku game so exciting and challenging. First look at the box in the middle of the sudoku table (where DEF cross MNO). The only possible cells for a 1 are in column N because we can’t put a 1s in cells EM and EO. Now let’s look at the box in the upper middle (where ABC cross MNO). We can’t put 1s in column N because we already determined that there must be a 1 in column N in the middle box. We can’t put 1s in row C because there’s already a 1 in cell CL. Therefore the only available cell for a 1 in this sudoku play is cell AM.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6   1
Step10: 1 9 7
4   6
     
3    
  5  
  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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