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13 May 2011 @ 12:01 am
Friday Puzzle #101 - Pentomino Shikaku  
I started this week planning to make a Shikaku variation that used some other shapes to adjust the usual rectangle logic a bit. I ended up with a puzzle that solves a lot more like a challenging Pentomino puzzle than a Shikaku. I can certainly see revisiting this with pentomino spots labeled with letters instead of fives, or simply adding some gray clues to a Shikaku for non-rectangles with a variety of sizes but no fixed set of pieces. For now, please enjoy this challenging unknown pentomino version.

Rules: Divide the grid along the dotted lines into rectangles and pentominoes. Each rectangle must contain exactly one black circle, with an area equal to the number in that circle; each pentomino must contain exactly one gray circle labeled with a five. All twelve pentominoes must be present in the grid; pentominoes can be rotated or reflected.

(Anonymous) on May 14th, 2011 07:33 am (UTC)
This was delightful,but not as challenging as your comment scared me when i started solving it.I did not have to use anything more tham simple counting logic for the rectangles.I thought this was more of pentomino placement than rectangles.I like the way disconnected regions relied on each other to solve the pentominos,like the 5 in the bottom-left depending on "L must go here" logic in the right-most half of the grid.the challenging part probably was to fix the 3 pieces in that right-most region.
I am waiting for the next polymino shikaku.

I had posted a shikaku variant yesterday.
(Anonymous) on May 16th, 2011 11:24 pm (UTC)
Pentomino Shikaku Solution?
Are you still posting solutions? You had previously indicated I could access solutions (after my inquiry regarding Make Room for Tapa) by typing in -soln before .png.

Following the sample link you provided for the MRFT puzzle, I tried for this one via: http://www.stanford.edu/~tsnyder/PentominoShikaku-soln.png as a guess, and that didn't work. Realize that I do NOT see your puzzles at the stanford...png address. Puzzles there seem to be at best months old. Instead, I access puzzles through your live journal. In this case, I see it at:

http://motris.livejournal.com/ or at

So, there is no .png address to put -soln before.

I also don't know how to access solutions via Wired, but perhaps that would be the way to go. Let me know. Thanks,
motrismotris on May 16th, 2011 11:33 pm (UTC)
Re: Pentomino Shikaku Solution?
This puzzle, as well as the 100 puzzle before it, do not have solutions posted (even in the secret places you are looking) yet. With the 100 puzzle, it was on purpose. With this one, it was mostly an issue of not having enough time to make the file and not planning to post the puzzle on WIRED anyway.

I'll try to make a solution this evening, which will be exactly where you expected, but I have a lot of things to finish before departing for a sudoku tournament in China in two days so it might slip back a day too.
motrismotris on May 17th, 2011 01:00 am (UTC)
Re: Pentomino Shikaku Solution?
And it's now there.
(Anonymous) on May 17th, 2011 05:02 am (UTC)
Re: Pentomino Shikaku Solution?
Thanks. Good luck in China.

Jon Michelson
Wildwood, MO