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Re: Fun challenge for best cool code
Posted: Thu Feb 28, 2019 1:31 pm
by hgm
EPDs have no 50-move or move-number fields. Only FENs have that...
Re: Fun challenge for best cool code
Posted: Thu Feb 28, 2019 8:23 pm
by Dann Corbit
hgm wrote: ↑Thu Feb 28, 2019 1:31 pm
EPDs have no 50-move or move-number fields. Only FENs have that...
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - fmvn 1; hmvc 0;
They have them, but they are decorated with a label.
Re: Fun challenge for best cool code
Posted: Fri Mar 01, 2019 6:44 am
by hgm
Sure. But they are optional, and 0, 1 are their default values.
Re: Fun challenge for best cool code
Posted: Fri Mar 01, 2019 10:58 am
by chrisw
Dann Corbit wrote: ↑Thu Feb 28, 2019 8:23 pm
hgm wrote: ↑Thu Feb 28, 2019 1:31 pm
EPDs have no 50-move or move-number fields. Only FENs have that...
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - fmvn 1; hmvc 0;
They have them, but they are decorated with a label.
I put that in as an issue to Python Chess about a week or so ago.
One more item: many online FEN strings come without the two final fields (moves since, movenum). the FEN reader complains. Might be useful if it added 0, 1, with some documentation explanation.
Response back:
I need this quite frequently myself, but never got around to do it. Now implemented in 65e8729. Defaults to 0 1.
So, I think Python Chess now accepts both:
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq x, y
and appends an 0, 1 if x, y missing. It used to just issue an error, "fen strings have six fields"
I'm not sure what happens if fmvn is specifically used as an identifier.
Re: Fun challenge for best cool code
Posted: Fri Mar 01, 2019 12:38 pm
by hgm
I hate pedantic interfaces. WinBoard just uses a default value 0 for the ply counter if it is missing, and ignores the move number anyway, when it parses a FEN.
I guess stupid old NotePad would not even have a problem doing this; just do a 'Replace All' on " id " for " 0 1 id " if you insist on beraking the EPDs that way.
Re: Fun challenge for best cool code
Posted: Fri Mar 01, 2019 2:53 pm
by niklasf
chrisw wrote: ↑Fri Mar 01, 2019 10:58 am
So, I think Python Chess now accepts both:
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq x, y
Yeah, on the master branch it now even defaults to
respectively. Not sure if that's a bit too relaxed ... in any case a user could parse, regenerate, compare to do strict validation.
chrisw wrote: ↑Fri Mar 01, 2019 10:58 am
I'm not sure what happens if fmvn is specifically used as an identifier.
This always worked as expected:
Code: Select all
>>> import chess
>>> board, ops = chess.Board.from_epd("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - fmvn 2; hmvc 3;")
>>> board
Board('rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 3 2')
>>> ops
{'fmvn': 2, 'hmvc': 3}
However it will still reject
because it attempts to parse this as a number or move.