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 10

 


Nearly there. Just Boxes 6 and 9 to finish off.

Column c7 has a 3 and an 8 missing but the existing 8 in c4r5 and 3 in c5r8 decides the placement.

One cell left in box 6 for a 2.

Row 8 requires a 1 and a 2 and the 1 in c8r2 sorts them out.

And finally, c8 is missing a 7 and c9 (and now r9) needs a 3.

We have a solution!.
c1
c2
c3
  
c4
c5
c6
  
c7
c8
c9
 
 
2
 4
1 		   
5 		 
9
6 		   
7
3		  
8
r1
 box

1
2
&
3
 
3 		-box 1-
7
  
6 		   
2 		-box 2-
4 		 
8 		 
9		 - box 3 
1
5
r2

8		  
5 		  
9		  
7 		 
1 		 
3 		   
2
4		  
6
r3

9
8
3		    
4
2		  
1		  
6 		  
5
7
r4
 box

4
5
&
6
 
6 		- box 4 
1
4 		 
8		 - box 5 -
7
5 		   
3 		- box 6 
9
 2
r5

5 		 
2
7 		 
3
6
9 		 
1		  
8
4
r6
 
7
3		  
8 		 
1
5 		 
2
  4
6
9
r7
 box

7
8
&
9

4 		- box 7 
9
5		  
6		 - box 8
3 		 
7 		 
 8 		box 9 - 
2
1 
r8
 
1
6
2 		 
9
8
4 		 
5
7 
3 
r9




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15th january 2010 © 2014