solve

 sudoku

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


c3 has a 2 in its last cell in box 7 which makes a 7 in the last cell of box 7.

Now c1 has only one cell left for a 2 in c1r1, and a 7 completes Box 1 and c2.

c4 also has only one cell free at c4r2 for the missing 2.

Box 8 is short of a 3 and a 7 but the existing 7 in c5 decides the placing. Just a 1 to finish off c5 at c5r3.

The last two numbers in Box 2 are 3 and 8 and are the opposite of 3 and 8 in Box 1.

r2 is short of a 1 and r3 needs a 2 to finish.

r1 needs 7 and 8 but the 7 in c9r4 decides the position.
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 		   
 - box 6 
9
 
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 		 
  		box 9 
 
 
r8
 
1
6
2 		 
9
8
4 		 
5
 
 
r9




[ contact me, Roger Walker ]

15th january 2010 © 2014