Author: Shane Hudson
Date: 19:25:05 04/28/02
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On April 27, 2002 at 16:33:28, Dieter Buerssner wrote: >Inspired, by Pavel's post >(http://www.talkchess.com/forums/1/message.html?226413) >and the following loss of my engine, I searched for pawnless endgames with more >than 3 pieces. > >I do not have any big databases. I used 2600.pgn from Dann Corbit, and wrote >some code to find those endgames (perhaps chess database programs can do this, I >have no idea). Perhaps some of you find it also interesting. No idea about commercial databases (I don't own any), but Scid makes it easy. It even comes with a sample small program for computing how often (in how many games) each possible 3/4/5/6/7-men material configuration occurs. The results for a 500,000-game database (without the 7-men figures) can be found at: http://scid.sourceforge.net/tbstats.html. The most frequent 3-3 pawnless are KRB-KRN, followed by KRB-KRB and KRN-KRN. For 3-2 pawnless, KRB-KR and KRN-KR occur far more often than anything else. Cheers, Shane >Some notes: >twice there was KRBKBN, both times the stronger side won. >Karpov-Kasparov: BNN could not win vs. R. They played more than 50 moves without >capture/pawn move. >Bareev-Milos: The game ended in draw, in a position where white has a forced >mate. >If I am not mistaken, there was no position that has the 6-men Nalimov TB >available (however KRBKBN positions can be looked up through the Web at a page >by Ken Thompson) > >I handled pawnless positions, that have only one minor piece advantage or less >(and not B-pair vs. N) as rather drawish. This is correct for all the positions >with 3 pieces. But I think, I must to come to the conclusion, that with more >pieces, a minor piece advantage, and perhaps even R vs. minor piece, is often >enough to win. Also, thanks to Dan Anderson for his comment. > >Regards, >Dieter [PGN games snipped]
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