Author: chandler yergin
Date: 13:44:04 08/26/03
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On August 26, 2003 at 15:15:51, Matthew Hull wrote: >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 That confirms then the "anti-computer" strategy that seems to work for Nemouth & a few other humans. Get it out of book and make it play their game. Thanks, CY
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