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OT: Promotion in chess

Posted By: Timothy Chow
Date: Friday, 2 September 2011, at 5:17 p.m.

In Response To: Touch Move rule, dangers (Steve Mellen)

Promoted pieces do lead to some interesting rule conundrums. As far as touch-move goes, suppose you advance a pawn to its promotion square, remove it from the board, and announce, "Queen." Then you pick up a queen that's off the board, stretch your hand out towards the promotion square, but then stop short, and say, "Sorry, I mean Knight." Then you put down the queen and put a knight on the promotion square. Have you violated the touch-move rule? (I learned this one from Tim Krabbé.) According the current FIDE rules, the answer is no.

Suppose, as White, you promote a pawn on e8 to a rook. If your king has not moved and there are no other pieces on the e-file and e1, e2, and e3 are not under attack, can you castle by moving Ke3, Re2? The rook hasn't moved yet, has it? (This one is also courtesy of Tim Krabbé.)

Raymond Smullyan carries the conundrum even further by supposing that you amend the rules of chess to allow promotion to a piece of your opponent's color. If Black hasn't moved his a8 rook yet and you play bxa8=BR, can Black castle with your promoted rook? Does it matter if you remove the current rook and replace it with another rook, as opposed to just removing your b7 pawn from the board without touching the rook?

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