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

Step 21   The logic used in this step is exactly the same as in step 18. Let’s look at the column N. There are only two empty cells left: HN & IN. The number 8 must  be in one of them because sudoku’s general rules specify the following: Every column must have the number 1 through 9 in it. We can’t put an 8 in cell IN because there’s an 8 in cell IQ on the same row. The only available cell is therefore IN.

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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  
8  
2 6 8
9 5 4
7 1 3
  5
    8
4  
2  
6  
7  
  9 7
5 Step21: 8 2
  6
5 6 3
7 4 1
9 8 2



   
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