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 10

 


Nearly there. Just Boxes 6 and 9 to finish off.

Column c7 has a 3 and an 8 missing but the existing 8 in c4r5 and 3 in c5r8 decides the placement.

One cell left in box 6 for a 2.

Row 8 requires a 1 and a 2 and the 1 in c8r2 sorts them out.

And finally, c8 is missing a 7 and c9 (and now r9) needs a 3.

We have a solution!.

c1
c2
c3
 
c4
c5
c6
 
c7
c8
c9
 
 
2

 4

1
   
5
 
9

6
   
7

3
 
8
r1
box

1
2
&
3
 
3
-box 1-
7
 
6
   
2
-box 2-
4
 
8
 
9
- box 3 
1

5
r2

8
 
 
9
 
7
 
1
 
3
   
2

4
 
6
r3

9

8

3
   
4

2
 
1
 
6 
 
5

7
r4
box

4
5
&
6
 
6
- box 4 
1

4
 
8
- box 5 -
7

5
   
3
- box 6 
9

 2
r5

5
 
2

7
 
3

6

9
 
1
 
8

4
r6
 
7

3
 
8
 
1

5
 
2
  4
6

9
r7
box

7
8
&
9

4
- box 7 
9

5
 
6
- box 8
3
 
7
 
 8
box 9 - 
2

r8
 
1

6

2
 
9

8

4
 
5

7 

3 
r9




[ contact me, Roger Walker ]

15th january 2010 © 2014