Author: Will Singleton
Date: 09:00:02 01/31/00
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On January 30, 2000 at 23:02:32, William Bryant wrote: >On January 30, 2000 at 19:23:33, Will Singleton wrote: > >>Amateur-Lambchop was a pretty good game today at the ICC tournament. Vincent >>pointed out that I missed a draw, and it looks like he was right. >> >>What programs see this? (w/o tablebases, which I assume would kick in) >> >>[D]3r4/8/8/P5R1/1K1pk2p/8/7P/8 w - - bm Rg4+ >> >>Will > >Will, > >I ran this in the current version of Screamer (which does not have table bases, >yet) and did not find a draw at 15:00 which is way beyond tournament time >controls. Screamer could not decide between the moves Rg4+, a6, Kc5, and Kb3. >It ultimately settled for Kb3 with about at -2.79. > >MacChess also switched between Rg4+, a6, Kc5, Rg1. It also didn't find a draw, >but I stopped between 2 and 3 minutes which I guessed as the move time. > >I would love to see the PV. I am assuming that tablebases make it easy (easier) >to see this? > >William >wbryant@ix.netcom.com I assume that with the tablebases, a program could trade off its rook for the two pawns, and then see the draw. But I don't know if TB probes are typically made at the root, or a couple ply into the search. The idea is to play Rg4+ Ke3 RxP d3 Rh3+ Ke2 RxP RxR and then the a-pawn has to be stopped by the rook, which is a draw. I would think that some program could evaluate the two outside passers against the rook as trouble for black, given the king positions. But no program I've tried so far can even approach this problem. Will
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