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1st January


MatPlus.Net Forum General Future castling
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(1) Posted by Hauke Reddmann [Sunday, Feb 10, 2019 16:25]; edited by Hauke Reddmann [19-02-12]

Future castling

Is it easy to decide if, from a given position, (e.g.) White may ever castle?
(Not just a help-00 in a limited number L of moves, which IS difficult.
Although, if L>50 with no capture or pawn move...See below)

It can get even worse (WTM):
(= 4+8 )

Only one party can castle in the future - if White castles, it's mate
in the next move or Black must forfeit castling anyway. If White does
not castle, his own right will be forfeit.
Now can you imagine such a position with retro-excluding castling rights?

(Background: Assume that the FIDE 3fold repetition rule would be
phrased "logically": two positions are identical if their potential
futures are identical, i.e. castling rights are evaluated factually,
not potentially. Now assume two problemist trolls driving the
arbiter insane by constructing a game position with the above property :-)


P.S. Addendum: P0004925 on the PDB. Should be fairly easy to add a few
pawns and get also retroanalytically mutually excluding castling.
(Read Only)pid=17027

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MatPlus.Net Forum General Future castling