Author: Miguel A. Ballicora
Date: 08:25:38 02/06/02
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On February 06, 2002 at 10:54:24, Heiner Marxen wrote: >On February 06, 2002 at 07:12:57, Gian-Carlo Pascutto wrote: > >>On February 06, 2002 at 06:35:22, Hans van der Zijden wrote: >> >>>With white to move Fritz thinks white is just a little bit better and it gives >>>the move R1e2, which is strange because there is only 1 rook that can go to e2. >> >>Fritz _may_ be correct. I'm not 100% sure I remember it correctly, >>but I don't think the SAN standard specifies that you don't have to >>disambiguate moves if some of them are not actually legal due to >>checks. > >Unfortunately not true. SAN talks about legal moves, only, and thus >disambiguates only between legal moves: > >8.2.3.4: Disambiguation >[...] >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". > >This is considered a design bug by some, but it is the current state of affairs. This is the way that human players have used it always. Not only I do no think it is not a bug decision, but I think it was the right decision. The algebraic notation is a human notation, not a computer one. Regards, Miguel > >>-- >>GCP > >Cheers, >Heiner
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