- Code: Select all

9XX X3X 7XX

XXX X5X X69

7XX X19 2X3

XXX 14X 5XX

X8X 5X3 X1X

XX2 X68 XXX

2X1 3XX XX5

X3X X8X XXX

XX7 XXX XX4

5 posts
• Page **1** of **1**

- Code: Select all

9XX X3X 7XX

XXX X5X X69

7XX X19 2X3

XXX 14X 5XX

X8X 5X3 X1X

XX2 X68 XXX

2X1 3XX XX5

X3X X8X XXX

XX7 XXX XX4

- busino06
**Posts:**3**Joined:**01 April 2006

busino06 wrote:Hey thx Ruud,yes I`m new at this.

Then you're probably stuck again after placing 8 in row 9, column 1 (r9c1=8)

Look at r6c9.

1 - can't go there because of the 1 in r5c8

2 - can't go there because of the 2 in r6c3

3 - can't go there because of the 3 in r3c9

etc. for all candidates except 7

Since there is only one digit that can go there, you can solve r6c9=7

So you have two techniques now,

r9c1=8 because there was no other cell in its box that could be 8.

In general, find the only cell in some box, row or column where you can put some candidate.

r6c9=7 because no other candidate would be legal here.

In general, find a cell where only one candidate can fit.

Those are all you need to solve this puzzle, but it will be tough.

Have fun!

Mac

- QBasicMac
**Posts:**441**Joined:**13 July 2005

5 posts
• Page **1** of **1**