Author: Les Fernandez
Date: 20:19:12 04/30/01
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On April 30, 2001 at 22:18:44, Dann Corbit wrote: >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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