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 6


With 9's in r4 and c4 there is only one place for a 9 in box 5 at c6r6 and the 9's in c7 and c9 fix the 9 in box 6 at c8r5.

The 9's in r7 and r9 define the 9 in box 7 at c2r8.

The new 9 in box 7 with the 9's in c1 and in r2 locates the 9 in box 1 at c3r3 . which in turn defines the 9 in box 2 at c5r1.

Another good ripple!.
c1
c2
c3
  
c4
c5
c6
  
c7
c8
c9
 
 
9
9 
1		    
5 		 
9
6 		   
3		  
r1
 box

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

8		  
5 		  
9		  
7 		 
9 		 
9 		   
4		  
r3


8
3		    
9
2		  
9 		 
9 		  
5
7
r4
 box

4
5
&
6
 
 - box 4 

4 		 
8		 - box 5 -
7
5 		   
9 		- box 6 
9
9 
r5

5 		 
7 		 
9
6
9 		 
1		  
8
4
r6
 
9
3		  
8 		 
1
5 		 
   4
6
r7
 box

7
8
&
9

4 		- box 7 
9
5		  
6		 - box 8
 
  
  		box 9 
 
 
r8
 
9
6
9 		 

8
4 		 
5
 
 
r9




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15th january 2010 © 2014