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Step by step example of solving a sudoku puzzle
Step 41   Let’s look at the bottom middle box (where GHI cross MNO). We can’t put 6s in columns M and O because there are 6s in cells EM and BO, respectively. Therefore, if we were to follow sudoku’s general rule, the number 6 must be in GN.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
7 3 9
6 8 1
1 9 7
4 8 6
2 5 3
3 6 8
1 5 2
4 9 7
2 6 4
1 5  
8 9  
7 3 9
6 2 8
5 1 4
5 8 1
9 3 4
2 7 6
  2 5
9 7 8
  1 6
  Step41: 6  
3 4  
9 7  
7   9
6   5
8   3



   
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