Author: Jeremiah Penery
Date: 13:53:23 01/31/00
Go up one level in this thread
On January 31, 2000 at 16:28:42, Howard Exner wrote: >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. 1. Rg4+ Ke5 2. Rxh4 d3 3. Rh5+ Kf4 4. Rh4+ Kf5 5. Rh5+ Kg4 6. Rh7 d2 7. Rg7+ Kf5, and black wins - E.g., 8. Rg1 d1=Q 9. Rxd1 Rxd1, and black has mate in 27 by TB.
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