Author: Robert Hyatt
Date: 05:36:38 09/08/02
Go up one level in this thread
On September 07, 2002 at 22:56:14, Peter McKenzie wrote: >On September 07, 2002 at 22:40:06, Robert Hyatt wrote: > >>On September 07, 2002 at 19:46:49, Peter McKenzie wrote: >> >>>I've been having a break from computer chess post WCCC, but have now started >>>going over some of Warp's games. First up is Warp's worst game, the loss vs >>>Brutus. In this game, Warp showed a total lack of understanding of its >>>centralised king in the early middlegame and lost without a fight. >>> >>>I present here the position after move 21 in the game. White has grabbed a pawn >>>thinking this position is OK, but in reality the white king is hopelessly stuck >>>in the centre. Also, white is passive, black is active and has a safe king, >>>therefore white is totally winning here: >>> >>>[D]r1r3k1/1p3ppp/b5q1/p7/4n3/P3PNB1/1P3PPP/1Q1RK2R b K - 0 1 >>> >>>I am curious what the static evaluation of various programs is here. The >>>version of warp used in Maastricht gives 0.238 in favour of white. Ideally the >>>static evaluation should favour black here I think. >>> >> >> >>Crafty says -.41 (good for black). Here is output of "score" command: >> >>note: scores are for the white side >>material evaluation................. 1.00 >>development......................... 0.00 >>pawn evaluation..................... 0.09 >>passed pawn evaluation.............. 0.00 >>passed pawn race evaluation......... 0.00 >>king safety evaluation.............. -0.42 >>interactive piece evaluation........ -1.08 > >that term seems to be the big one here, I guess it is mainly the B on a6 >preventing castling? > >cheers, >Peter It is actually king-safety related. I have a function EvaluateKingSafety that returns that -.42... But that isn't the "whole story". After doing all the piece evaluations, there is another king safety term that is a second/third-order type scoring term. But it is inside Evaluate() which is why it doesn't show up in king safety. This -1.08 is a result of pieces interacting together and a sense of "uneasiness" about the white king in the center of the baord... I'll try to get some details tonight... > >>total evaluation.................... -0.41 >> >> >> >> >> >>>cheers, >>>Peter
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.