Author: Ulrich Tuerke
Date: 06:35:48 03/05/98
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On March 05, 1998 at 05:39:03, Kai Lübke wrote: >Now Fritz took a 2 minute search (approx.) going to 14 or 15 ply IIRC, >yet returned a draw score for Rc2. >Rebel instantly said +4,30 for Rxc2 then. > >*Then*, surprisingly, Fritz needed only a few seconds to report a -4 >score itself! Really strange why it didn't see it before, that one extra >ply can't be the only reason. > >But I've seen similar (though not quite as drastic) things time and >again, that one program made a deep search, returned an even score, >predicted its opponent's move correctly and then suddenly dropped to -3 >in seconds... > This behavior is quite typical for a "pre-processing" program, i.e. a program performing large (time consuming) parts of the evaluation at the root nodes only. Even a very deep search does not have the chance to change the results of the pre-processor's evaluation, but will only slightly correct these root evaluations. But when it comes to the next move, a new run of the pre-processor will correct the evaluation. Seems to me, that something like this happened. Regards, Uli
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