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

Step 46   Let’s look at the middle left box of the sudoku (where DEF cross JKL). There are two blank cells and two missing number – one of which is 7. The number 7 can’t be in cell FK because there’s a 7 in cell FM. Therefore, if we were to follow sudoku’s rules, the number 7 must be in cell EK.

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J K L M N O P Q R
A
B
C
D
E
F
G
H
I
1 8 7
5 4 3
9 2 6
3 4  
6 2  
8 7  
2   6
8   7
    4
4 9 1
3 Step46: 7 2
8   5
2 6 8
9 5 4
7 1 3
3 7 5
6 1 8
4 2 9
2 1 8
6 3 9
7 5 4
4 9 7
5 8 2
1 3 6
5 6 3
7 4 1
9 8 2



   
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