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Step by step example of solving a sudoku puzzle
Step 34   Let’s look at the middle right box of the sudoku grid (where DEF cross PQR). Since each number must appear once in each vertical column of the sudoku table, we can’t put a 6 in cell DR because there’s a 6 in cell DK. Since each number must appear once in each horizontal row of the sudoku table, we can’t put a 6 in cell ER because there’s a 6 in cell EM. Therefore, there must be a 6 in cell FR.

 
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  
1 5  
8 9  
7   9
6 2  
5   4
5 8  
9 3  
2 7 Step34: 6
  2 5
9 7 8
  1 6
     
3 4  
9 7  
7   9
6   5
8   3



   
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