Author: Robert Hyatt
Date: 07:29:53 09/11/01
Go up one level in this thread
On September 10, 2001 at 21:24:01, Dave Gomboc wrote: >On September 10, 2001 at 07:24:18, Gian-Carlo Pascutto wrote: > >>On September 10, 2001 at 05:56:21, Uri Blass wrote: >> >> >>>This leaves 36.Bxe5! Bxe5* 37.Nc5! dxc5 38.Rxe5 Rxa2* 39.bxc4 Bxc4 40.Rxc5 which >>>looks like White should be able to grovel a draw here too. >> >>After Ba6 Crafty and Hiarcs have -1.8 here. >> >>That sure is close enough to -2 for me. >> >>-- >>GCP > >In general, perhaps what we're seeing is that some chess programs are assessing >these ending rather optimistically. If a human thinks they've got serious >drawing chances, they'd never assign a score of +2. +2 should indicate a >decisive advantage. DJ6 has been giving +1 to some (but not all) of these >endings that I've been coming up with, but my comments like "and White should be >able to grovel a draw" are based upon my own, weak expert assessment. > >I haven't been able to check every line (who can?) but I am coming around to the >view that DT2 was able to find +2 back at ...c5. I do also think that the score >is not completely deserved (e.g. that crafty and DT2 are overassessing Black's >advantage in some of the endgames). And it's clear that no, DT2 isn't winning a >piece. So everybody has something to be happy about. :-) > >Dave "Winning a piece" can mean many things in this context. One thing I did _not_ do in Cray Blitz was the "bad trade" code that is in crafty. CB would often (just like several commercial programs) choose to give up a piece for two pawns, rather than give up a single pawn. Since the material score for both is identical, trading a piece for two pawns often would create a passed pawn that would swing the scorein that direction. It is very likely that Cray Blitz had to choose between several lines that led to -2.0... one of them a piece down, and a pawn up, the other two pawns down. The tree is too big for me to try to prove that it was one, or the other, or both of these...
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