Author: Howard Exner
Date: 13:28:42 01/31/00
Go up one level in this thread
On January 31, 2000 at 13:32:52, Jeremiah Penery wrote: >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. 1. Rg4+ Ke5 2. Rxh4 d3 3. Rh5+ and white has to continue with the checks on the h file until of course black moves the king to the g file. But when that happens white plays moves like Rh7 or Rh3. Then follows d2 Rg7+(Rg3+) K f(whatever) R g1.I'm still getting a draw. Black misses a win by one tempo as after the eventual exchange on d1 the black King is on the f file. > >>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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