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Step by step example of solving a sudoku puzzle
Step 38   Let’s look at the middle box (where DEF cross MNO). We can’t put a 1 in cell DN because there’s a 1 in cell DR – remember the main sudoku rule - you can’t repeat the same number twice in a column or a row. We can’t put a 1 in cell EO because there’s a 1 in cell EJ. Therefore, the number 1 must be in cell FN.

 
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   9
6 2  
5 Step38: 1 4
5 8 1
9 3 4
2 7 6
  2 5
9 7 8
  1 6
     
3 4  
9 7  
7   9
6   5
8   3



   
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