Author: William Bryant
Date: 21:37:26 12/04/99
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On December 04, 1999 at 21:54:03, Vincent Diepeveen wrote: >On December 04, 1999 at 15:01:57, Côme wrote: > >>Hello, >>In this position: >>8/prr2p1p/2R5/PP2pP2/3pRbPk/2pB3P/2P3K1/8 w - - 0 1 >>Does your program play the strong Rxf4! ? >>Best Regards >>Alexandre Côme > >from 13 ply and on diep prefers Ra6 here. it's not happy. >but getting slowly happier. starting at -1.1 or something >to -0.7 for Rxf4 from 6 ply to 13 ply it plays rf4 then >from 13 ply and further it picks Ra6 at 16 ply still ra6 but dropped from >-0.25 to -0.44 (which is bad for the side to move) Vincent, I was wondering if you could post the PV and evaluations scores for this search. I ran this position longer on my program, and from ply 10 to 16 it never wanted to switch to Ra6. I also ran it on MacChess 5.0.1 for 15 ply and it also never switched from Rxf4 although it spent quite some time on the move Ra6 at each ply. Below are the Scores, Node Counts, and PV's from both programs. William wbryant@ix.netcom.com Screamer Ply Depth = 16 Node Count at Depth 16 = 140544458 Score = +0.73 PV = Rxf4 exf4 Rh6+ Kg5 Rxh7 Re7 Rh5+ Kf6 g5+ Ke5 Kf3 Re8 g6 Rf8 Rh7 Re7 MacChess Ply Depth = 15 Node Count at Depth 15 = 385709853 Score = -17 PV = Rxf4 exf4 Rh6+ Kg5 Rh5+ Kf6 g5+ Ke5 Rxh7 Rb8 g6 Re7 Kf3 Rf8 Kg4 Rc7 g7 Re8 Rh8 Rcc8
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