Author: Reinhard Scharnagl
Date: 16:18:01 09/09/03
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Hello, > FEN: One deficiency exists for which I take responsibility; the en passant > target square semantics should indicate a non null value only if an active > color pawn attacks the passed-over target square. A change here will > improve position database operation and can also have a positive effect on > internal transposition management. Also, there is the possibility of > extending the castling availability semantics to accommodate heterodox > / unorthodox chess. 1) targeting on enabling FRC chess beeing encoded by FEN I proposed a sligth extension to make all FRC positons encodable, cited from [http://www.rescon.de/Compu/fullchess5_e.html]: [...] FRC-FEN: possible castlings marked by "KQkq" have to be reinterpreted: a) as for a standard the rooks standing at the baseline most outside are targeted, b) "Qq" means the a-side, "Kk" the h-side. Some unlikely positions there really do exist having more then one rook beside the king at the baseline, in which some special castling rights cannot be expressed at all by conventional FEN. That are those situations, where one more rook is standig outside beside of a rook having castling rights. Here following downwards compatible FEN supplement will be helpful by appending a letter for the affected column immediately after the matching castling symbol (only if related to a rook not outermost). [ You may test the FRC-FEN with the freeware FullChess FEN Editor ! ] [...] 2) I agree with the suggestion to encode e.p. only, when the preceding double move sets its pawn neighboured to an opponent pawn. I should not be relevant, whether an e.p. capturing would be legal. Regards, Reinhard
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