solve

 sudoku

  step 1 2 3 4 5 6 7 8 9 10
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A very easy puzzle to get the idea of how sudoku is solved
Roger Walker
explanations:-
this is step 5


Again, just the 7's in rows 4 and 6 are enough to define the 7 at c5r5 for box 5.

The 5's in r8 and c6 define the 5 in box 8 at c5r7 and the 5's in c7 and c8 with the same 5 in c6 positions the 5 in box 6 at c8r4.

The new 5 in box 8 with the 5 in c6 and in r2 locates the 5 in box2 at c4r1 which in turn defines the 5 in box 1 at c2r3.
Finally, the new 5 in c2 with the 5 in c3 fixes the position of the 5 in box 4 at c1r6.

It often happens that finding one number ripples through the puzzle with satisfying results.

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
 
5

5 

1
   
5
 
5

6
   
3
 
r1
box

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

8
 
5  
7
 
5
 
5
   
4
 
r3

9

8

3
   
7

2
 
7
 
5 
 
5

r4
box

4
5
&
6
 
5
- box 4 
5

4
 
8
- box 5 -
7

   
5
- box 6 
5

 
5
r5

5
 
5

 
7

6

7
 
1
 
8

4
r6
 

3
 
8
 
1

5
 
5
  4
6

9
r7
box

7
8
&
9

4
- box 7 

 
6
- box 8
5
 
5
 
 
box 9 
 

 
r8
 

6

 
9

8

4
 

 

 
r9




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15th january 2010 © 2014