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Step by step example of solving a sudoku puzzle
Step 45   Let’s look at the bottom left box of the sudoku game (where GHI cross JKL). We can’t put a 3 in IJ because there’s a 3 in cell IR. Therefore according to sudoku rules, the number 3 must be in cell GJ.

 
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 7
8 9 3
7 3 9
6 2 8
5 1 4
5 8 1
9 3 4
2 7 6
Step45: 3 2 5
9 7 8
  1 6
8 6  
3 4  
9 7  
7   9
6   5
8   3



   
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