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

Step 41   In this step, we use the same sudoku reasoning as the one in step 29, except we use it in a column instead of a row. Let’s look at column R. We already found 8 out of the required numbers. We have one blank cell and one missing number and the solution is very obvious. The number 9 must be in cell FR.

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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   1
3 2
8   5
2 6 8
9 5 4
7 1 3
3   5
    8
4 2 Step41: 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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