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122 votes
Accepted

Mate in 0 moves

White must Indeed Note that
Evargalo's user avatar
  • 6,290
97 votes
Accepted

Checkmate in 1 on a Tangled Board

Since the puzzle turned out to be way hairier than expected, my earlier answer got quite messy and hard to follow, so here's a complete rewrite. It's still very clunky, but I hope it's much clearer ...
Bass's user avatar
  • 77.7k
90 votes
Accepted

Can White Castle?

Now that we have three increasingly complex proofs (two deleted, one of them mine) that it's impossible, it's pretty clear that it must be Here's why: This is, without doubt, the most refreshing ...
Bass's user avatar
  • 77.7k
83 votes

Mate in 0 moves

I see Evargalo has found the right answer, but the first thing that occurred to me was
Especially Lime's user avatar
44 votes
Accepted

Chess : The Lone King

Here's a solution: Here's some of the logic for finding it: Here's a link to the moves: Clear the board! And here's a gif (thanks to chess.com's gif maker):
Dr Xorile's user avatar
  • 23.7k
35 votes

Can White Castle?

(Edit: so this is wrong..) Brilliant puzzle! The answer is: [Spoiler alert! Scroll down at your own risk] We proceed by contradiction. Assume that indeed, White can castle. We have the ...
greenturtle3141's user avatar
29 votes
Accepted

How did four chessmen disappear?

This seems to work: And the position looks like this: Apart from the symmetrical solution, this might very well be unique:
Bass's user avatar
  • 77.7k
29 votes
Accepted

A Checkmate of Dubious Legality

I claim that The reason:
Deusovi's user avatar
  • 147k
27 votes
Accepted

Which word wasn't with Wednesday's ...crossword

The word that doesn't belong is The crossword looks like this: How I solved it:
GentlePurpleRain's user avatar
26 votes
Accepted

Musical message from a long-lost uncle

Featured in the past, compositions by musical uncle Francis, at: Handbill: La-Fa-Sol-Do-Re Ti-Fa-Sol-Do-Re Ti-Ti-Do-Sol-Mi-Re Sol-Do-Do-Mi-Sol Sol-Ti-La-Fa-Mi-Re-Mi-Re Ti-Fa-...
humn's user avatar
  • 21.9k
22 votes
Accepted

Megan mated by a king move

Oooh, that's a nice one. First of all, Further more, it's a mating move by I first tried (in vain) to So it must be It turns out that with the following moves: Final position:
Glorfindel's user avatar
  • 28.1k
21 votes

Chess Construction Challenge #6: The One Move Royale

Vepir has helped twice in this answer, first in spotting a mistake and then with an improvement in the number of moves. Please got upvote their answer too if you like this one. Here is a position with ...
hexomino's user avatar
  • 137k
21 votes
Accepted

Can White still castle?

My answer is To back it up, To explain how I found this answer, Also note that Now the difficulty is that How recently
isaacg's user avatar
  • 7,138
20 votes
Accepted

Let's continue our Monopoly game

It is currently: because All that means it is now the
dcfyj's user avatar
  • 7,756
20 votes

Mate in 0 moves

Not exactly a checkmate, but there is an option with a similar effect that can be performed in zero moves:
Ray's user avatar
  • 373
19 votes
Accepted

Unfinished Snakes and Ladders

The other guys already got the answer. (Maybe not with completely airtight arguments, but nevertheless.) The explanations would be a lot easier to follow if they had pictures, so here's one: Legend: ...
Bass's user avatar
  • 77.7k
19 votes

Only one square for the white king

HTM's answer is very nice and must be what's intended here. But I'm not quite seeing why the puzzle isn't cooked as follows:
Gareth McCaughan's user avatar
17 votes
Accepted

Only one square for the white king

Note that without their king, White’s plan would be Thus, the aforementioned sequence of moves will The only square White’s king can be in that satisfies the constraint is
HTM's user avatar
  • 16.3k
17 votes
Accepted

Scholar's mate with queen excluder

Given the queen excluder constraint, this position is Reasoning: Comment answer:
NielasAran's user avatar
16 votes
Accepted

Find this Mate in 1

I assume Then
SteveV's user avatar
  • 15.9k
15 votes
Accepted

A poorly-designed chess problem

Well, for the mate in 1, For a mate in 2, An assured path to victory: As to the final question: EDITED after the sudden appearance of the corner knight: The stuff in the spoiler tags got shuffled ...
Bass's user avatar
  • 77.7k
15 votes
Accepted

White's last move?

In the position shown, Now, Before that Black White So we have the following sequence of events. Now, We still haven't figured out Suppose that Now So let's consider We must now be quite ...
Gareth McCaughan's user avatar
15 votes
Accepted

Retrograde Analysis Problem Inspired by Various Chess Memes

Looks interesting, let's see.. Since the white king is in check, the previous move can only have been "black somehow moves a pawn to b5. There are three available starting squares for the pawn ...
Bass's user avatar
  • 77.7k
14 votes

Chess : The Lone King

I found the following: The key is that
Sconibulus's user avatar
  • 19.7k
14 votes

Checkmate in 1 on a Tangled Board

To add on to Glorfindel's answer,
Usernome's user avatar
  • 346
14 votes

Chess Construction Challenge #6: The One Move Royale

Score: Position: Moves: Fun fact,
Vepir's user avatar
  • 2,968
13 votes
Accepted

My colleague got mad!

rand al'thor points out that and since the numbers are but after the square marked 16, Robert's got this (image courtesy of OP) and we can now see why Robert is distressed: ... which is a ...
Will's user avatar
  • 13.9k
13 votes

Unfinished Snakes and Ladders

It is: Reasoning:
Evan Capstick's user avatar
13 votes
Accepted

Tht Aain’t Right... #2

I suspect the broken rule is Allowing the checkmates A hint pointing to this answer:
Jafe's user avatar
  • 78k
13 votes
Accepted

Can White Castle? #2

The answer is Reasoning: So This could only happen White's f and g pawns So would be
Glorfindel's user avatar
  • 28.1k

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