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

What are your nominations for the best puzzles, here on Puzzling.SE, of the fourth quarter ( October / November / December ) 2018?

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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The Two-Trench Truce by Level 51

In the words of ManyPinkHats who solved it:

That is a very impressive amount of content to fit in such a tiny cryptic.

This is one of those puzzles that, even upon seeing the solution, I look at and still wonder how the creator actually went about crafting it. Multiple layers of moving parts all crammed into a tiny package make for an impressive effort from a purely technical perspective. However, add to that a thematic consistency and conclusion that makes you smile and you've got a truly great puzzle.

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lolcatz can haz ur infinit cheeseboard by deep thought

User deep thought took a chess board, expanded it into infinity, and added one (1) chess piece with extraordinarily clever (if somewhat complicated) movement rules.

The result? A chess problem that the entire humankind (well, at least, all the mathematicians) would applaud if ever solved.

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Which movie will we watch? by formica

I spent a ton of time on (and really enjoyed) this puzzle.

I think it was quite simple and elegant in its construction, but still managed to stump the majority of the community for a significant amount of time, even with the 5.5 clues provided by the OP

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