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 3


The 8's in c1 and c2 and the 8 in row 9 define the position of the 8 in box 7 at cell c3r7.

 

 

 

The 4's in c8r3, c3r5 and the new 4 we just found in c7r7 define the 4 at c9r6 for box 6.
As before, according to the rules, there cannot be another
4 in the same row of r5 and columns c7 and c8 but there must be a 4 somewhere in box 6.

 

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
 
 

1
     
6
   
3
 
r1
box

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

     
7
       
 
r3

9


3
   
2
   
x 4  
 
x 4

7
r4
box

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

x 4  
r5
   
7
   
6
   
1
 
x 4

4
r6
 
x-8

3
 
8
 
1
     

9
r7
box

7
8
&
9

4
- box 7 
x-8

5
 
6
- box 8    
 
box 9 
 

 
r8
 
x-8

6

x-8
 
9


4
 
5

 

 
r9




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15th january 2010 © 2014