Author: Louis Fagliano
Date: 11:35:15 01/18/05
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On January 18, 2005 at 14:00:59, José Carlos wrote: >On January 18, 2005 at 13:54:57, Louis Fagliano wrote: > >>On the web site http://www.drb.insel.de/~heiner/Chess/PGN_Standard.txt under >>section “8.2.3.4: Disambiguation” I quote the following: >> >>“In the case of ambiguities (multiple pieces of the same type moving to the same >>square), the first appropriate disambiguating step of the three following steps >>is taken: >> >>First, if the moving pieces can be distinguished by their originating files, the >>originating file letter of the moving piece is inserted immediately after the >>moving piece letter. >> >>Second (when the first step fails), if the moving pieces can be distinguished by >>their originating ranks, the originating rank digit of the moving piece is >>inserted immediately after the moving piece letter. >> >>Third (when both the first and the second steps fail), the two character square >>coordinate of the originating square of the moving piece is inserted immediately >>after the moving piece letter.” >> >>But it is impossible for both the first and the second steps to fail. If two >>pieces have the same originating file AND rank, then they are both standing on >>the same square! The only way that the first and the second steps could fail is >>if chess were three-dimensional. > > > Look at the diagram. This position is legal (you promote a knight) and needs >third rule fo a Ne4: >[D]4k3/8/8/2N5/8/2N3N1/8/4K3 w - - 0 1 > > José C. > I stand corrected. Thanks for pointing that out.
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