Author: Dave Gomboc
Date: 17:20:38 06/04/99
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On June 04, 1999 at 19:39:36, Mike Leahy wrote: >On May 27, 1999 at 20:48:55, Dann Corbit wrote: > >>From the PGN Standard > > >>16.1.4: Examples >> >>Here's the FEN for the starting position: >> >>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 >> >>And after the move 1. e4: >> >>rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1 > >This is problematic. The position is identical to... > > rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1 The position you describe with the string not containing "e3" is not technically reachable (even ignoring the ply count for now) because Black can't lose a move while White slides a pawn first to e3, then to e4. My personal opinion is that the standard should be that an en passant square is only specified if an en passant capture is actually possible, and "-" is always used otherwise. However, this wasn't SJE's choice. I can imagine various justifications that might be made for his choice, but none so strong that they override the clarity of our preferred format. While you are toying around with Bookup EPD handling, please allow assessments to be in the range -32768 to 32767, or at least automatically translate between this range and the range -10000 to 9999 when importing and exporting into/from Bookup. Currently it is annoying to deal with the issue of checkmates in my opening analysis, I have to find that a score is missing in the first place, followed by entering it by hand. >...because the en passant capture is not legal. Purely >positional programs like Bookup are fussy about this. >Bookup considers the record with 'e3' as illegal. Programs >like Rebel solve the program by ignoring the en passant flag(!). Does Rebel ignore the "e3" or "-" if the position actually does allow an en passant capture, or just if no en passant capture is possible? If the former, it's buggy! If the latter, excellent input handling! :) >Mike Leahy Dave
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