# sudoku

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explanations:-
this is step:- 22

Note 2
The last cell in col 1 must be a 2. The new 8 in box 7 makes a 5 in c3/r2 and so an 8 next door.
Just one cell left for 7

Note 3
With the 7 & 5 in box 1 defined, box 4 can be finished

Note 1
The new 4 in box 9 makes the 8 in box 7, then the 2, then the 3. Below the 3 must now be a 7 with the 2 and 3 gone and the last cell a 4. This 4 decides the 3 & 4 in box 8 and the 2 in box 9, the last in row 8

c1
c2
c3

c4
c5
c6

c7
c8
c9

 27
2
3
6   5 4 9   8 1
 27
r1
box

1
2
&
3
1
 258
8
 258
5
7
 box 2
6
 8 3

 234
4
 box 3
9
 235
r2
4
 578
7
9   2 1
 8 3

 367
 56
6
 357
r3
8 4 3   9 7 5   1 2 6
r4
box

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

7
8
&
9
 2375
7
 box 7
9
 4  257
4

 3 4
3
 box 8
8
6
 2347
2
5 1
r8
 357
5
6 1
 3 4
4
9 2
 347
8
 357
r9
 ___________________________________ 15th january 2010 © 2014