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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 third quarter ( October / November / December) 2021?


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):

Algorithmically selected "best of":

Best by votes/views:


Meta-meta issues:

Q: Is this kind of thing allowed on SE?
A: Yes, Photography SE and Sci-Fi & Fantasy SE do something very similar.

Q: What's the point?
A1: To highlight and encourage good practice in a way that goes beyond upvotes.
A2: 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'.
A3: To prompt members to put forward their own reflections on what makes a high-quality puzzle.

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1 Answer 1

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White is winning here. But how? by Hobacle

This is an absolutely beautiful chess problem that includes unintuitive sacrifices and several brilliant "wait, but--" moments. It stumped quite a few of the chess enthusiasts here and apparently even manages to fool Chess.com's and Lichess's analysis engines for a few moves. It was also the user's first post on Puzzling, which makes it even more impressive.

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