solve

 sudoku

  step 1 2 3 4 5 6 7 8 9 10
  <home

A very easy puzzle to get the idea of how sudoku is solved
Roger Walker
explanations:-
this is step 6


With 9's in r4 and c4 there is only one place for a 9 in box 5 at c6r6 and the 9's in c7 and c9 fix the 9 in box 6 at c8r5.

The 9's in r7 and r9 define the 9 in box 7 at c2r8.

The new 9 in box 7 with the 9's in c1 and in r2 locates the 9 in box 1 at c3r3 . which in turn defines the 9 in box 2 at c5r1.

Another good ripple!.

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
 
9

9 

1
   
5
 
9

6
   
3
 
r1
box

1
2
&
3
 
3
-box 1-
 
9
   
9
-box 2-
9
 
9
 
- box 3 
5
r2

8
 
 
9
 
7
 
9
 
9
   
4
 
r3


8

3
   
9

2
 
9
 
9 
 
5

7
r4
box

4
5
&
6
 
- box 4 

4
 
8
- box 5 -
7

5
   
9
- box 6 
9

9 
r5

5
 

7
 
9

6

9
 
1
 
8

4
r6
 
9

3
 
8
 
1

5
 
  4
6

r7
box

7
8
&
9

4
- box 7 
9

5
 
6
- box 8
 
 
 
box 9 
 

 
r8
 
9

6

9
 

8

4
 
5

 

 
r9




[ contact me, Roger Walker ]

15th january 2010 © 2014