Author: Dann Corbit
Date: 19:18:44 04/30/01
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On April 30, 2001 at 22:13:21, Les Fernandez wrote: >Can someone tell me the details as far as what are the standard rules for >describing castling rights in an EPD string. ie .....w Kq. Is there a >particular order that is the defacto standard??? Sorry I did not return your email Les, I've been a bit busy. Anyway, you were also wondering about e.p., so here it is from the horse's mouth: 16.1.3.3: Castling availability The third field represents castling availability. This indicates potential future castling that may of may not be possible at the moment due to blocking pieces or enemy attacks. If there is no castling availability for either side, the single character symbol "-" is used. Otherwise, a combination of from one to four characters are present. If White has kingside castling availability, the uppercase letter "K" appears. If White has queenside castling availability, the uppercase letter "Q" appears. If Black has kingside castling availability, the lowercase letter "k" appears. If Black has queenside castling availability, then the lowercase letter "q" appears. Those letters which appear will be ordered first uppercase before lowercase and second kingside before queenside. There is no white space between the letters. 16.1.3.4: En passant target square The fourth field is the en passant target square. If there is no en passant target square then the single character symbol "-" appears. If there is an en passant target square then is represented by a lowercase file character immediately followed by a rank digit. Obviously, the rank digit will be "3" following a white pawn double advance (Black is the active color) or else be the digit "6" after a black pawn double advance (White being the active color). An en passant target square is given if and only if the last move was a pawn advance of two squares. Therefore, an en passant target square field may have a square name even if there is no pawn of the opposing side that may immediately execute the en passant capture.
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