solve

 sudoku

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A very easy puzzle to get the idea of how sudoku is solved
Roger Walker
explanations:-
this is step 2


On this first step, I will only find one easy number to make it easier to see what is going on. On later steps, I will do more numbers per page to speed things up.

 

 

Finding easy numbers:-

The 4's in c1r8, c6r9 and c8r3 define the 4 at c7r7 for box 9 as, according to the rules, there cannot be another 4 in the same row of r8 and r9 and column c8 but there must be a 4 somewhere in box 9.

 

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
 
 

1
     
6
   
3
 
r1
box

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

8
     
7
       
 
r3

9

8

3
   
2
       
7
r4
box

4
5
&
6
  - box 4 
4
 
8
- box 5 -
5
    - box 6   
r5
   
7
   
6
   
1
   
r6
 
3
   
1
      4
x 4

9
r7
box

7
8
&
9

- box 7 
5
 
6
- box 8    
x 4
box 9 
x 4

x 4
r8
 
6
   
9

8

 
5

x 4

x 4
r9




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15th january 2010 © 2014