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a slightly trickier Tectonic (Suguru)
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Posted on: Wed Sep 28, 2022 5:06 pm

Posts: 3320
Joined: Thu May 12, 2011 11:58 pm
a slightly trickier Tectonic (Suguru)
.. working on improving my Tectonic (/ Suguru) generator:

https://www.instagram.com/p/CjDgT-isIKo/

Posted on: Wed Sep 28, 2022 5:24 pm

Posts: 3320
Joined: Thu May 12, 2011 11:58 pm
Re: a slightly trickier Tectonic (Suguru)
It is interesting to keep removing clues and see if the puzzle is still doable:

Posted on: Sun Oct 02, 2022 12:54 pm

Posts: 3320
Joined: Thu May 12, 2011 11:58 pm
Re: a slightly trickier Tectonic (Suguru)
I was working on the code that computes a valid set of numbers, given a Tectonic / Suguru grid,
and kept running into a "blocked" configuration, where putting the final number would produce an invalid set.

After trying to improve the code for a while, I decided to take a closer look at the grid:

10 points if you can spot the problem

Posted on: Sun Oct 02, 2022 2:52 pm

Posts: 3320
Joined: Thu May 12, 2011 11:58 pm
Re: a slightly trickier Tectonic (Suguru)
Here's one where in one step I used the fact that the puzzle must have a unique solution (!)

Posted on: Sun Oct 02, 2022 10:26 pm

Posts: 3320
Joined: Thu May 12, 2011 11:58 pm
Re: a slightly trickier Tectonic (Suguru)
pnm wrote:
...

10 points if you can spot the problem

A similar problem with this one:

Posted on: Mon Oct 03, 2022 10:43 am

Posts: 75
Joined: Tue Mar 10, 2015 5:59 pm
Re: a slightly trickier Tectonic (Suguru)
That is indeed a funny problem. Perhaps you can prevent it by not allowing the L- or U-shape at all, since they will always cause this problem.

Posted on: Mon Oct 03, 2022 10:52 am

Posts: 3320
Joined: Thu May 12, 2011 11:58 pm
Re: a slightly trickier Tectonic (Suguru)
rafaelhoukes wrote:
That is indeed a funny problem. Perhaps you can prevent it by not allowing the L- or U-shape at all, since they will always cause this problem.

Yes, that's one of the first things I added yesterday

There's also a quick check that fills each cage with numbers,
and checks if any neighbouring cell has become "impossible" because of it.

It's interesting because it makes you wonder if these cage layouts have certain properties.

Looking at other such puzzles online, there do seem to be a lot of "expansive" cages
(ones that cover more rows and columns). I also wonder if having more "boxy" cages
means you're forcing the numbers to alternate in a more regular pattern (if the puzzle
is possible at all).

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