Author: José Carlos
Date: 11:00:59 01/18/05
Go up one level in this thread
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. >That last paragraph should be deleted, but I don’t know who the author is. Does >anyone know? > >Another interesting note on section “8.2.3.4: Disambiguation” is the next >paragraph: > >“Note that the above disambiguation is needed only to distinguish among moves of >the same piece type to the same square; it is not used to distinguish among >attacks of the same piece type to the same square. An example of this would be >a position with two white knights, one on square c3 and one on square g1 and a >vacant square e2 with White to move. Both knights attack square e2, and if both >could legally move there, then a file disambiguation is needed; the >(nonchecking) knight moves would be "Nce2" and "Nge2". However, if the white >king were at square e1 and a black bishop were at square b4 with a vacant square >d2 (thus an absolute pin of the white knight at square c3), then only one white >knight (the one at square g1) could move to square e2: ‘Ne2’.” > >I believe in the situation above with the skeleton position White Ke1, Nc3, Ng1 >and Black Bb4 if the knight on g1 goes to e2 then ChessBase and all ChessBase >programs GUI’s still print out the move as “Nge2” and not “Ne2”. > >Not that this is a big deal, but there should be some standard set for all >GUI’s.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.