Author: Robert Hyatt
Date: 08:30:47 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." Look at the kbbkn.tbs files on my ftp machine. It looks like there are more draws than wins in kbbkn. in knnkn for example there are hardly any wins at all. Ditto for kbnkn, but for kbbkn there are lots of wins, but (it seems after a quick look) still way more draws. > >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? Yes... and there are now _no_ exceptions to the 50 move rule, if any kind. They were all rescinded years ago. KBB vs KN is won in many cases, but it is also drawn in many as well I don't think the 50 move rule applies here anyway. The longest mate is something like 68. And half-way thru that the knight is taken resetting the 50 move counter. > >Cheers, >Jim
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