Author: karen Dall Lynn
Date: 05:58:34 02/01/02
Go up one level in this thread
On February 01, 2002 at 02:44:18, Mike Hood wrote: >I'm posting the whole game of an engine-engine match I played on my PC. White >was Hiarcs 7.32, Black was Chess Tiger 14.0, both were using 128 MB Ram. The >time conrol was 40'/40+40'/40+40' > >The strange move is move 121. The position looks to me like a drawn game. Hiarcs >thought for 25 seconds to a search depth 13, evaluated Ka6 as 0.0, made his >move, and oops! -- he'd overlooked a mate in 1. > >I've tried duplicating this error in vain. In analysis mode Hiarcs sees the >Mate. Has anyone else noticed similar things happening with Hiarcs? > >--- > >[Event "Strange Hiarcs Error"] This error is a particular instance of a more general error: that of the dramatic change in evaluation following a move alredy done. Worse: for some bad moves, sometimes the dramatic change comes only a little after you force the move. If you undo the move evaluations reset to their anterior state in which the move is unsuspicious, but after forcing the same move again a big change is seen again - and we ask ourselves how and why the brainy engine did not see the flaw coming while it was a move back and in time to avoid it. May this change be for green-up or for red-down arrows, chess programs really do that sometimes, but only rarely they engage in a blunder that is just passing by the analysis stream. It means that proficient computer chess playing should not relax the need of chess knowledge for the human operator - I learned from a friend with a GM profile that sometimes (mainly in the openings) forcing/refusing moves in the light of human experience improves the computer further conditional choices. I have experienced once, with Fritz 6, an useless Queen sacrifice followed by a resign 10 moves ahead. Your case is still more fascinating, since an 1 move mate was overlooked - treasure it, it is a pearl and a very rare blunder against our friends automata. Karen
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.