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 sudoku
 to step 0 1 2 3 4 5 6   <home
explanations:-
this is step:- 1



I pick up the easy numbers first by working through 1 to 9 in the rows of boxes then the columns of boxes.

c2r1 must be 8 because of the 8's in boxes 2, 3 and 7. The rules allow for only one 8 in any box and any row or column but box 1 must have an 8. I'll stop colouring the row/columns now as you've got the idea.

c1r4 must be 4 due to the 4's in boxes 5, 6 and 7

The 4's in boxes 6, 7 and 8 make 4 in box 9.
c1
c2
c3
  
c4
c5
c6
  
c7
c8
c9
  
 
7
must be 
8
 
no 8		  
 
1
 
no 8
 
no 8		  
 
no 8
 
no 8
 
2
r1
 box

1
2
&
3
 
no 8
box 1 
no 8
 
no 8		  
 
no 8
box 2 
no 8
 
6		  
 
no 8
box 3 
8
 
no 8
r2
 
no 8
 
no 8
 
no 8		  
 
8
 
no 8
 
no 8		  
 
1
 
no 8
 
9
r3
 
4
 
 
7		  
 
 
 
9		  
 
 
1
 
r4
 box

4
5
&
6
 
box 4 
9
 
3		  
 
box 5 
 
 
 
5
box 6 
4
 
r5
 
 
6
 
no 8		  
 
4
 
 
 
 
9
 
 
r6
 
3
 
no 8
 
8		  
 
 
 
4		  
 
 
 
r7
 box

7
8
&
9
 
no 8
box 7 
4
 
no 8		  
 
3
box 8 
 
 
 
box 9 
 
r8
 
1
 
no 8
 
no 8		  
 
 
 
5		  
 
4
 
 
3
r9


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12th october 2009