Author: Joachim Heuser
Date: 11:38:04 06/09/01
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On June 09, 2001 at 11:32:09, Robert Hyatt wrote: >On June 09, 2001 at 04:37:32, Joachim Heuser wrote: > >>On June 08, 2001 at 22:11:56, Jim Monaghan wrote: >> >>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. > What i meant was: from nearly every position, where the two bishops are on different colours and the knight cannot capture one of those bishops in the next move, the two bishops can force mate or winning the knight, though this may take more than 50 moves. I set up some rather ugly positions with the two bishops not working together and it took ~40-50 moves (according to cb-tablebases) to capture the knight. In the book german book from Kishon: "Schachcomputer" (1993), the author claims that the machine "Alice" analysed this endgame to be always won (he doesn't state when this analysis took place). There was a position, too, which should take longest to capture the knight (66 moves): K7/8/7B/8/8/5k2/6n1/7B w - - 0 1 wKa8,Bh1,h6/bKf3,Ng2 I wasn't able to create a drawn position which matches the pattern mentioned above.
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