Author: Dieter Buerssner
Date: 11:37:18 04/16/03
Go up one level in this thread
On April 15, 2003 at 17:23:09, Will Singleton wrote: >r1br2k1/p1q2ppp/2n2n2/2B5/P1BNp3/1QP1P3/5PPP/R4RK1 b - - > >Some programs never show an elevated score, others show +2 or so before figuring >it out. It has to do with a piece that is guarding a pinned piece at the end of >the pv. Ruffian and Yace 99.5 exhibit the problem, while Tao doesn't. I'm >wondering if this problem is due to a lack of extensions in the pv, or a qsearch >artifact, or something else. >10 216 736 3122242 Ne5 Qb4 Nxc4 Nb5 Qc6 Qxc4 Rd5 Rd1 Rxc5 Rd8 Ne8 > >However, at the end of that pv, you get the following position: This PV is 11 ply deep, probably no extensions (?). I just tried Yace, and it neede 11 ply, to get a drawish score. Disabling all pruning in qsearch (and using even some very limited extensions in qsearch) did not make a difference. But it is probably a bit more complicated as that. I also should check carefully, if really all pruning in qsearch was disabled. At least the line QxR QxQ RxN+ Qf8 RxQ KxR should be seen in qsearch here. Can you show some analysis of programs, that never show a higher score of black? Regards, Dieter
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.