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Andrew Buchanan

Singapore

White to move. Where is the original White queen's rook?

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60
When (if ever) was it a rule that pawn promotion was optional?
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35
Has anyone attempted to characterize chess mathematically?
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18
I was playing a tournament and some kids were talking about the game in a foreign language
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18
Why do players in the past play much longer tournaments than today's top players?
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17
A chess question of W.T. Tutte
mathoverflow.net

16
What is the maximum number of passed pawns in a position?
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13
A Special Parking Lot
puzzling.stackexchange.com

12
Can a king be checked with another king when checking square is protected by the side which gives the check?
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10
Square Free Position
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10
50-move rule: FIDE wording seems weird
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10
Is this selfmate solvable or fixable?
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9
Problem: reconstruct the game
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9
Official rules for castling in Chess960? (Is there a loophole?)
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9
Is a Finite State Machine a good way to model chess?
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9
How likely is it that a non-orthodox promotion is optimal?
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8
Is the position in this trick question reachable?
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8
Is Beth Harmon behaviour in her game vs Georgi Girev acceptable (then and now)?
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8
Is it possible to have a double self-smothered stalemate?
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8
What ambiguities remain in the laws of chess?
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8
Mutual Stalemate
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7
Fastest possible checkmate by en passant
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7
How many different ways are there to checkmate in the early game?
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7
E.Umnov's chess problem, 1944. Checkmate in two moves
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7
Arrange 5 non-attacking knights on a 5x5 toroidal board
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7
FIDE threefold repetition and possible moves
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7
Maximum number of pieces on board in dead position
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7
How to play for a draw
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6
Checkless Chess
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6
Is a queen vs rook endgame always winning?
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6
Could a chess engine do retro analysis?
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