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a4v17 - Two possible solutions
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Posted on: Sat Aug 11, 2018 12:27 am

Posts: 455
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
a4v17 - Two possible solutions
I thought I must have made a mistake when completing this puzzle as the final four cells (A2 to B3) were interchangeable. But the solution I entered was accepted as correct. As far as I can tell, I could swap the four cells and still get a valid solution, or am I missing something?

Posted on: Sat Aug 11, 2018 10:46 am

Posts: 2455
Joined: Thu May 12, 2011 11:58 pm
Re: a4v17 - Two possible solutions
paulv66 wrote:
I thought I must have made a mistake when completing this puzzle as the final four cells (A2 to B3) were interchangeable. But the solution I entered was accepted as correct. As far as I can tell, I could swap the four cells and still get a valid solution, or am I missing something?

Can you send me the solutions via email?

edit: never mind, I checked the puzzle and am seeing the same thing (so far).

Not sure yet if the new & operator, the fact that it's a "from zero" puzzle,
or the fact that it's a twin puzzle is to blame

Posted on: Sat Aug 11, 2018 10:57 am

Posts: 733
Joined: Fri May 13, 2011 6:51 pm
Re: a4v17 - Two possible solutions
paulv66 wrote:
I thought I must have made a mistake when completing this puzzle as the final four cells (A2 to B3) were interchangeable. But the solution I entered was accepted as correct. As far as I can tell, I could swap the four cells and still get a valid solution, or am I missing something?

After your post I have solved the puzzle (just now, very easy BTW) and I think you are right, two solutions, simply swapping the 4 numbers in (a2-b2-a3-b3) (I sent the smaller one in a2 scoring the 8 points).

A possible solution could be to break the cage "0&" (a3-b3-a4-b4) into two vertical 2-cell cages, with "0&" for (a3-a4) and "3-" for (b3-b4) what solves the uncertainty.

Posted on: Sat Aug 11, 2018 11:10 am

Posts: 455
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
Re: a4v17 - Two possible solutions
Hi Patrick

I've sent a scanned copy of my solution.

Paul

Posted on: Sat Aug 11, 2018 11:23 am

Posts: 2455
Joined: Thu May 12, 2011 11:58 pm
Re: a4v17 - Two possible solutions
paulv66 wrote:
I've sent a scanned copy of my solution.

from now on I'll need written proof of all solutions before points are awarded

Posted on: Sun Aug 12, 2018 8:52 pm

Posts: 2455
Joined: Thu May 12, 2011 11:58 pm
Re: a4v17 - Two possible solutions
I checked this now, and am happy to see that my solver is working correctly,
and that this twin should never have been accepted for the book...

Will check the logs next.

Also, the nice thing about selling this book as a PDF (so far), is that I can send everyone an updated copy once done,
and of course put an updated version online

edit: this has been done now, and thanks to clm for the suggested correction.

I've also double-checked the other twins in the book, they're all ok

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