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Step by step example of solving a level 5 (very hard) sudoku puzzle

Step 28   Let’s look at row G. There are two blank cells (GK & GL) and according to sudoku rules, the number 1 must be in one of them. Remember a row MUST contain all the numbers from 1 through 9. We can’t put 1 in cell GL for there’s a 1 in cell DL on the same column. Therefore, 1 must be in cell GK.

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J K L M N O P Q R
A
B
C
D
E
F
G
H
I
1   7
5 4  
9   6
3 4  
6 2  
8 7  
   
    7
    4
4   1
3 2
8  
2 6 8
9 5 4
7 1 3
3   5
    8
4 2
2 Step 28: 1  
6  
7  
4 9 7
5 8 2
1 3 6
5 6 3
7 4 1
9 8 2



   
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