Author: Jeremiah Penery
Date: 10:32:52 01/31/00
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On January 31, 2000 at 12:00:02, Will Singleton wrote: >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. After Rg4 Ke3, my modified Crafty (with TBs) could find the draw. However, after Rg4 Ke5!, Rxh4 no longer works. It's _really_ difficult to find a draw now. >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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