Author: Bruce Moreland
Date: 13:44:37 08/23/00
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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
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