solve

 sudoku

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explanations:-
this is step:- 2



Only one cell for a 4 in box3 now we have the new 4 in box 9.

c3r6 only cell left for 1 in box 4 which in turn, makes the 1 in box 1

The 3's in box 4 and box 7 make 3 in box 1.

I can't see any more easy ones so I now work through each cell listing the possible numbers considering the existing numbers in its relative box, row and column. This takes time and concentration.

.
c1
c2
c3
  
c4
c5
c6
  
c7
c8
c9
  
 
7
 
8
 
 
 
1
 
 
 
 
 
 
2
r1
 box

1
2
&
3
 
box 1 
1
 
 
 
box 2 
 
6		  
 
box 3 
8
 
4
r2
 
 
3
 
 
 
8
 
 
 
 
1
 
 
9
r3
 
4
 
 
7		  
 
 
 
9		  
 
 
1
 
r4
 box

4
5
&
6
 
box 4 
9
 
3		  
 
box 5 
 
 
 
5
box 6 
4
 
r5
 
 
6
 
1		  
 
4
 
 
 
 
9
 
 
r6
 
3
 
 
8		  
 
 
 
4		  
 
 
 
r7
 box

7
8
&
9
 
box 7 
4
 
 
 
3
box 8 
 
 
 
box 9 
 
r8
 
1
 
 
 
 
 
 
5		  
 
4
 
 
3
r9



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15th january 2010 © 2014