solve

 sudoku

  step 1 2 3 4 5 6 7 8 9 10
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A very easy puzzle to get the idea of how sudoku is solved
Roger Walker
explanations:-
this is step 4


The 3's in c2 and c3 and the 3 in row 1 define the position of the 3 in box 1 at cell c1r2.

 

 

 

This time, just the 8's in rows 4 and 5 are enough to define the 8 at c8r6 for box 6.
The new 4 helped us here.

 

Same applies to the 6 found in box 9.

 

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
 
x 3

x 3 

1
     
6
   
 
r1
box

1
2
&
3
 
3
-box 1-
x 3
 
x 3
    -box 2-    
9
- box 3 
5
r2

8

x 3  
 x 3  
7
       
4
 
r3

9


   
2
   
x 8  
 
x 8

7
r4
box

4
5
&
6
  - box 4 
4
 
- box 5 -
5
   
x 8
- box 6 
x 8

x 8  
r5
   
7
   
6
   
1
 
8

4
r6
 

 
8
 
1
      4
6

9
r7
box

7
8
&
9

4
- box 7 

5
 
- box 8    
 x 6
box 9 
  x 6

x 6 
r8
 


 
9

8

4
 
5

x 6 

 x 6
r9




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15th january 2010 © 2014