Author: Mark Ryan
Date: 20:45:44 08/23/00
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On August 23, 2000 at 16:44:37, Bruce Moreland wrote: >On August 23, 2000 at 13:43:12, Larry Griffiths wrote: > >>My old principle continuation printouts used to be: >> >>e2-e4 a1xd1 etc. >> >>I converted them to short algebraic notation since this seems to be very popular >>and the test suites seem to use this for best move. >> >>If I remember correctly, pawn moves are e4 g7 etc and captures are bxe4 hxg7 >>etc. >> >>Other moves are Rf4 Qb6 etc and captures Rxf4 Qxb6... >> >>I cant remember what the notation looks like when the same type of pieces can >>move or capture to the same square and the notation shows which piece to move. >>Something like ra4-b4? >>How should these look? >> >> >>I would also have to make/unmake all the moves at the root ply and look for the >>cases when 2 or more like pieces can capture or move to the same square. >> >>Any comments? >> >>Larry. > >Piece moves: > >The short case is Ne4. >If there is a capture it is Nxe4. >A check is Ne4+. >A mate is Ne4#. >If two knights can get to e4, but only one of them can get there legally (the >other one is pinned) it is Ne4. This is an important rule to remember, and it >can be difficult to implement. >If two knights can get there, and they are on a different file, it's Nce4. >If they are on the same file, it's N3e4. (You always use Nce4 if you can, N3e4 >is a last resort.) >If you are talking about queens, and there are a bunch that can reach the same >square, you might have to say Qd3e4, if there is more than one queen on the >d-file, and more than one queen on the 3rd rank, each of which can legally reach >e4. > >An interesting question is whether if two knights can go to e4, and one move is >mate and the other one isn't, do you have to disambiguate? I believe that you >do. > >Castling: > >O-O >O-O-O > >These are "oh's", not "zero's". You can also have O-O+ and O-O#, of course. > >Pawns: > >P-K4 is e4. >If it checks or checkmates it's e4+ or e4#, respectively. >A capture is exd6. >En-passant capture is also exd6, no need to say "e.p." or anything. >Queening is e8=Q. >Capturing and queening is as you'd expect: exd8=Q. > >If a move results in a draw, there is nothing that indicates this, in the move >itself. > >bruce Great post. About draws, in FIDE notation, I believe that a player is obligated to indicate the offer of a draw (whether accepted or declined) with an equal sign. I don't know if this matters. Cheers, Mark
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