Author: Robert Hyatt
Date: 08:32:09 06/09/01
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On June 09, 2001 at 04:37:32, Joachim Heuser wrote: >On June 08, 2001 at 22:11:56, Jim Monaghan wrote: > >>>Sorry, but 2B's don't always win against a knight. If you take the >>>position after Bxf2 Kxf2, and remove the final pawn, this is a dead >>>drawn tablebase ending. The KBBKN tablebase will show this pretty >>>easily. >> >>I don't know Bob. This is interesting. In the book "Endgame Magic" by Beasley >>and Whitworth the authors say in an appendix: >> >>"In the absence of pawns, two minor pieces against one is usually a draw, but >>the special case of two bishops against a knight has been proved by a computer >>to be a win." > > >I am quite sure that nearly every position from KBBKN is won for the two >bishops. Sorry, but you are quite wrong. Go to my ftp site, cd to the TB/tbs directory, and download kbbkn*tbs and take a look. More draws than wins. >In the position mentioned above, after Bxf2 Kxf2, Tiger claims Nd7 to be a draw >(0.01), but after Bxd3 it's mate in 43. > > > >>I'm not a FIDE rules guru, but I believe the 50 move rule had been extended in >>special situations of which this_may_be_one. This point has been overlooked in >>the discussion. >> >>Any FIDE rules experts here? > > >I don't know for sure, but i think the rule was extended for a short time to >cover endgames, where best play is mate >50 (of course without moving pawns or >capturing pieces). >After is was discovered that this was the case for quite a lot of endgames, it >seemed to be too complicated to set a limit for each of these endgames, so the >rule was returned to 50 moves. > > >Joachim
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