Author: Joachim Heuser
Date: 01:37:32 06/09/01
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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. 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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