solve

 sudoku

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explanations:-
this is step:- 18

 


As column 6 in box 2 must have a 3, it follows that column 6 in box 5 below cannot have a 3

So c6r5 must be 4 and the last cell is 3
It follows that as the 4 has gone in box 5, cell c7r5 must be 5
.
Finally, there is only one place for 4

 

Continue finding all values for empty cells in the last column of boxes 3, 6 & 9

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
279 
 
3
6 279
 
 
5
 
4
9
 
 
8
 
1
 
r1
box

1
2
&
3
 
1
258 
258 
 
 
7
box 2 
6
8 3
 
 
box 3 
9
 
r2
 
4
578 
6 5789
 
 
2
 
1
 8 3
 
 
 
 
r3
 
8
 
4
 
3
 
 
9
 
7
 
5
 
 
1
 
2
 
6
r4
box

4
5
&
6
 9 25
box 4 
1
9 25 
 
 
6
3 4
3
3 4
4
 
4 5 
5
box 6 
7
 
8
r5
 
6
 7 25
7 25 
 
 
8
 24
2
 
1
 
 
9
 
3
 4 5
4
r6
23 
 8 2
24  8
 
 
1
 
5
 
7
 
 
9
r7
box

7
8
&
9
2375 
box 7 
9
4  257
 
3 4 
box 8 
8
 
6
 
 
box 9 
 
1
r8
357 
 
6
 
1
 
 3 4
 
9
 
2
 
 
 
8
 
r9



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15th january 2010 © 2014