solve

 sudoku

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explanations:-
this is step:- 5



... cleaning up box 9 and removing 269 other than in c8 defines the 7; and 8 is the last cell in c7.

The new 8 in box 9 with the 8's in c4 and r7 fix the 8 for box 8 at c5r9

The 1 in c3r6 makes 8 in c6r6. That's been there waiting for a while.

The new 7 in r7 makes the 2 in c2r7 which in turn makes 9 in c4r7 and 7 in c2r9.

Now that 2 and 9 are fixed in row 7, c8r7 must be a 6

Clean up possibilities left.
c1
c2
c3
  
c4
c5
c6
  
c7
c8
c9
  
 
7
 
8
49 
 
 
1
49 
3 
3		  
6 
6
 5
5
 
2
r1
 box

1
2
&
3
259 
box 1 
1
259 
 
2579 
2579 
 
6		  
37 
3
box 3 
8
 
4
r2
56 
 
3
 456
 
 
8
45 
27 
2		  
 
1
37 
7
 
9
r3
 
4
25 
5
 
7		  
256 
6
235678 
3
 
9		  
 28
2
 
1
68 
8
r4
 box

4
5
&
6
 82
box 4 
9
 
3		  
27 
12678 
178 
 
 
5
box 6 
4
678 
6
r5
825 
 
6
 
1		  
 
4
258 
18 
8		  
 
9
23 
3
78 
7
r6
 
3
27 
2
 
8		  
29 
9
12679 
 
4		  
27 
7
269 
6
15
r7
 box

7
8
&
9
 2569
box 7 
4
2569 
 
 
3
126789 
17 
 
278 
8
269 
 15
r8
 
1
 27
7
269 
 
279 
26789 
8
 
5		  
 
4
 269
 
3
r9



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15th january 2010 © 2014