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This question is part of the best-puzzle award series.


What are your nominations for the best puzzles, here on Puzzling.SE, of the second quarter ( April / May / June) 2019?

Suggested guidelines for nomination:

  • Nominate each individual puzzle in a separate answer, so they can be upvoted/downvoted separately.

  • No more than 3 nominations per person.

  • Don't nominate your own puzzles.

  • Before you nominate a puzzle, check to see if someone else has already nominated it. If they have, then add to that nomination as a comment (or edit it) instead of nominating the same puzzle again.

  • In your nomination, explain what it is that (in your opinion) makes the nominated puzzle such a good one.


Some lists to help jog your memory (your nomination doesn't have to be from these lists):


Meta-meta issues:

  • Is this kind of thing allowed on SE?

  • What's the point?

    • To highlight and encourage good practice in a way that goes beyond upvotes.
    • To work towards building a 'hall of fame' of some of the best puzzles on the site (perhaps to reside on a future puzzling.SE blog) - think of it as our 'greatest hits album'.
    • To prompt members to put forward their own reflections on what makes a high-quality puzzle.
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How can this shape perfectly cover a cube? by plasticinsect

Because, of course, how the heck can this shape perfectly cover a cube??!!

enter image description here

It also gets a bonus point with the marvelous answer by Deusovi and the breathtaking animation by Wossname!

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    $\begingroup$ Nice one indeed! If PuzzleSE wouldn't have an icon yet, that would totally qualify! $\endgroup$ – BmyGuest Sep 25 '19 at 15:09
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Can White Castle? by shoopi

An amazing chess problem with several twists built into it - what starts out looking like a question with an obvious answer becomes increasingly unclear. The final result (which I won't spoil here!) involves multiple arguments about the entire history of the game up to the given point.

I was blown away when the answer was revealed, because I was convinced that the correct answer would turn out to be the opposite (and I had been attempting to write a proof of that fact for a while). And I wasn't the only one! Check out greenturtle3141's answer for a full explanation of how convoluted this puzzle can get.

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    $\begingroup$ Also worth a shout out, is another retrograde analysis chess puzzle by shoopi, Checkmate in 1 on a Tangled Board. $\endgroup$ – Alconja Sep 25 '19 at 5:03
  • $\begingroup$ Noticed this topic on the "hot meta questions", and actually copied this very same puzzle's link on my clipboard before coming here. The "tangled" problem was quite intricate, too, but this one was an outright work of art. $\endgroup$ – Bass Sep 27 '19 at 12:23

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