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 1


The numbers given for this easy puzzle are in red.

Columns are c1 to c9
Rows r1 to r9
3x3 boxes 1 to 9

ie.the 8 in box1 is at c1r3

The rules -
Each column, row and 3x3 box must contain the numbers 1 to 9 once

I start by looking at rows of boxes (like boxes 7, 8 and 9) or columns of boxes looking for easy numbers that can only go in one cell.

See solution at step 10 to see what we are trying to achieve

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
       
4
 
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
         
9
r7
box

7
8
&
9

4
- box 7 
5
 
6
- box 8       box 9   
r8
 
6
   
9

8

4
 
5
   
r9

FREE - download here a tiny zip file for printing a sudoku grid using Word or Excel (checked clear of nasties)

A Sudoku grid


A good read in
and ...
[ The Sudoku Book ] [ The Book of Sudoku : The Hot New Puzzle Craze ]

A good read in and ...
[ The "Telegraph" Sudoku: (Book 1) (Book 2) ]
[ The "Times" Su Doku: (Book 1) (Book 2) ( Book 3) ]

[ Carol Vorderman's How to Do Sudoku ] [ Su Doku for Dummies) ]
[ The Little Book of Sudoku ] [ The Big Book of Su Doku ] [ How to Solve Su Doku ]

[ contact me, Roger Walker ]

30th april 2008