Author: Tim Foden
Date: 08:37:56 11/30/01
Go up one level in this thread
On November 30, 2001 at 10:55:00, Les Fernandez wrote: >On November 30, 2001 at 10:44:47, Andreas Stabel wrote: > >>On November 30, 2001 at 10:13:58, Les Fernandez wrote: >> >>>In the following position can someone tell me how to properly represent the >>>capture of the black pawn on e4. It is white to move. Obviously we cant just >>>say "de" since we could be talking about the capture of the e5 pawn. Secondly >>>regarding pawns are their any other positions that exist that have other types >>>of ambiguities. >>> >>>[D]2k5/8/8/4p3/3Pp3/3P4/8/1K6 w - - >>> >>> >>>Thanks >> >>There is absolutely no ambiguity here because in the PGN/SAN standard you >>should always give the full destination square of a pawn move, so it >>should be dxe4. > >Hi Andreas > >First of all am I to understand that there is no 2 character designation for a >pawn move, say e4?? Why do you say this in reply to Adreas? He did not say that there was no short form... just that the destination square is always given in full (except for castling). In the case of Pe2e4 the destination square is e4, and SAN only requires that you say e4 in this case. Here is a passage relevant to this from the specification. The first paragraph is quite pertinent. <<<<< 8.2.3.3: Basic SAN move construction A basic SAN move is given by listing the moving piece letter (omitted for pawns) followed by the destination square. Capture moves are denoted by the lower case letter "x" immediately prior to the destination square; pawn captures include the file letter of the originating square of the capturing pawn immediately prior to the "x" character. SAN kingside castling is indicated by the sequence "O-O"; queenside castling is indicated by the sequence "O-O-O". Note that the upper case letter "O" is used, not the digit zero. The use of a zero character is not only incompatible with traditional text practices, but it can also confuse parsing algorithms which also have to understand about move numbers and game termination markers. Also note that the use of the letter "O" is consistent with the practice of having all chess move symbols start with a letter; also, it follows the convention that all non-pwn move symbols start with an upper case letter. En passant captures do not have any special notation; they are formed as if the captured pawn were on the capturing pawn's destination square. Pawn promotions are denoted by the equal sign "=" immediately following the destination square with a promoted piece letter (indicating one of knight, bishop, rook, or queen) immediately following the equal sign. As above, the piece letter is in upper case. <<<<< > Or is it only legal since it does not involve a capture or >is this not considered standard? > >Listen I thought I had the doc on the PGN/SAN standard but judging by what you >have stated perhaps I dont have the complete/thorough report. Can you tell me >where I might find this? I would appreciate it and thanks for your help. The one I work from starts like this: <<<<< Standard: Portable Game Notation Specification and Implementation Guide Revised: 1994.03.12 Authors: Interested readers of the Internet newsgroup rec.games.chess Coordinator: Steven J. Edwards (send comments to sje@world.std.com) <<<<< This may be a bit old, but is probably valid anyway. Cheers, Tim.
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