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MatPlus.Net Forum Promenade Moves only playable "once in a lifetime"
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(1) Posted by Hauke Reddmann [Monday, Jun 28, 2021 09:55]

Moves only playable "once in a lifetime"

Which kind of moves can happen only once per (orthodox) game?

You may answer boring ("White castles") but also
troll to your hearts content ("White plays Nf3 exactly for the second time").
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(2) Posted by Siegfried Hornecker [Monday, Jun 28, 2021 10:52]

Any pawn move from the second rank, castling, any en passant.
Also giving checkmate or stalemate.
And the first king or rook move, which disallows castling.

In very rare cases, other moves can be played only once.
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(3) Posted by edderiofer [Tuesday, Jun 29, 2021 05:46]

A lifetime is more than an orthodox game. With that in mind, a once-in-a-lifetime chess move might be something like "getting disqualified for shoving both bishops up Magnus Carlsen's nose". Unless of course you're Magnus Carlsen.
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(4) Posted by Joost de Heer [Tuesday, Jun 29, 2021 06:31]

Is "I resign" a move?
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(5) Posted by Hauke Reddmann [Tuesday, Jun 29, 2021 11:32]

@Joost: Think not, but nice try. That said, also @Siegfried,
any move that ends the game (which also includes dead position,
threefold repetition and hitting the 50 move rule).
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(6) Posted by Frank Richter [Tuesday, Jun 29, 2021 12:56]

Any move written in full notation is unique during a chess game ... you may play 17.Bc4 only once ;)
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(7) Posted by Joost de Heer [Tuesday, Jun 29, 2021 14:40]

Which moves can be played 6 times, but not more?
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(8) Posted by Siegfried Hornecker [Tuesday, Jun 29, 2021 18:08]

Pawn promotions in the corners (i.e. a7-a8, or h7-h8, or a2-a1, or h2-h1 - one of them can be played only six times in a game.)
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(9) Posted by Geir Sune Tallaksen Østmoe [Wednesday, Jun 30, 2021 00:03]

Off-topic, but the first thing I thought about when I saw the headline: I once played the move Qdxg5#. That’s a different type of «once in a lifetime» move.
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(10) Posted by Hauke Reddmann [Wednesday, Jun 30, 2021 09:47]

Geir, you should be ashamed, I'm just a FM and NEVER needed two queens to win :-)

(After some thinking: OK, OK, now I remember a game'o'mine where even five queens
were on the board for one second...But I didn't actually USE my three, so there.)
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(11) Posted by Andrew Buchanan [Sunday, Jul 4, 2021 16:04]

Maybe somewhere in my attic in London I still have a game score which made no sense when I came to analyse it. Essentially after one move as White I played -wRa1 -wPa2 +wRa1. What this means is that in stretching for the clock I knocked two pieces onto the floor but only thought to replace one of them. The pawn might still be lying under a desk 50 years later for all I know. Amazingly I developed the rook via the now half-open a-file, without either of us ever wondering about the missing pawn. I was able to launch a speedy kingside attack and win easily.

Once in a lifetime...
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MatPlus.Net Forum Promenade Moves only playable "once in a lifetime"