Invalid puzzle?

zoltag · Post by **zoltag** » Mon Sep 11, 2006 12:11 am

Hi Ruud. This puzzle is probably invalid (multi-solution) but version 1514 solves it and doesn't warn me that there are multiples. Might I have something set wrong?

Code: Select all

 *-----------*
 |...|...|..3|
 |...|...|96.|
 |..8|7..|54.|
 |---+---+---|
 |.9.|.68|...|
 |.7.|.54|...|
 |.5.|9..|3..|
 |---+---+---|
 |.39|...|2..|
 |..4|681|...|
 |...|...|...|
 *-----------*

Edited by author: I found part of the problem, I am working with an open sdm file when this happens. Your program does spot the multiples unless it gets the line from the sdm file.

Post by **Ruud** » Mon Sep 11, 2006 12:44 am

Hi Zoltag,

you have made no error.

The puzzle has 11 solutions. Go to the options panel, click "No Uniqueness" and "OK". When you load the puzzle after that, the solver will report that the puzzle cannot be solved. Hit F9 and it will tell you that there are 11 solutions.

When uniqueness tests are enabled, a false positive is given. I will have to change the solver to do a validity check BEFORE it is allowed to use these uniqueness tricks. That will be built into the next version.

Thanks for reporting this.

cheers,
Ruud

zoltag · Post by **zoltag** » Mon Sep 11, 2006 12:50 am

Thanks Ruud.

I'll turn uniqueness off!

nj3h · Post by **nj3h** » Mon Sep 11, 2006 2:54 pm

Hi Ruud,

When I went and set "No Uniqueness" how dows one tell it is set next time you go to the solver screen? Suggest a check box of some kind to clearly show if uniquenss is selected or not.

Regards,
George