Author: Matthew Hull
Date: 12:15:51 08/26/03
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On August 26, 2003 at 15:13:11, Matthew Hull wrote: >On August 26, 2003 at 14:10:11, chandler yergin wrote: > >>A question from a Novice here, so please bear with me. >>If, a Chess Program is "out of book", then the static weights given to the >>program in the quiescent position determines the evaluation? >>This may vary from program to program right? >>Which is why different programs often disagree even in the PV & secondary line? >>What comes to mind is the Urusov Opening, where very few games have been played. >>Statistically, the White wins are not credible; for example, Steinitz & lasker >>both fell into an Opening trap or combination, so if the program picks a move >>statistically, it would not be the best. >>I'm just trying to understand more about how the program works when on it's own >>so to speak. >>Any info would be helpful, >>Thank You, >>CY > >You are correct. A badly composed opening book can land a program in a bad >position from which it's evaluation function may not be able to deliver it. For >instance, if a program plays closed positions badly, then having an opening >library full of those kinds of destinations will scupper that program's chances >of winning against opponents good at closed postitions. > >Using human play statistics alone to compose opening libraries not sound as you >have correctly pointed out. That's why commercial programmers hire out this >kind of work, especially for championship events, tuning the book (and keeping >it secret) to suit the strengths of the program in question. > >In this way, and with a little luck, a mediocre engine might lift it's ELO >performance in an event. > >MH Also, the engine's evaluation function is NOT active while the game remains in book. The program itself does not start "thinking" until book moves have been exhausted. MH
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