Author: Jaime Benito de Valle Ruiz
Date: 06:23:35 12/21/03
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On December 21, 2003 at 09:05:42, Omid David Tabibi wrote: >On December 21, 2003 at 08:53:39, Jaime Benito de Valle Ruiz wrote: > >>I've never read any thread about this before, so forgive me if this is a >>recurring topic. >>Many people have noticed that the Principal Variation shown by Shredder is >>sometimes ridiculous, to the point of giving out its queen and a rook for >>nothing, or allowing a silly mate. > >My understanding is that unlike most other engines when failing high or low >Shredder does display a full PV extracted from hash tables (whereas other >engines just show the first move). These moves have naturally bounded scores, >and so are not reliable. That is also one of the main problems in extracting PV >using MTD(f) search. But other than that, Shredder's PVs are accurate. > I used to retrieve the PV from the hash table... and sometimes I got "funny" PVs as well. Maybe you're right > >>If this is “really” what Shredder is >>thinking, then I’m truly surprised that it’s such a strong engine… considering >>that it chooses absurd lines that lead to self-destruction. My engine sometimes >>does something similar, and I’m sure it’s a bug, because the final static >>position of the PV does not match the score is showing anyway (I have other >>things to correct before the PV at the moment anyway), and neither does for >>Shredder. >>Is this a really a bug, or just a trick to conceal the way engine is doing the >>internal search? Because I don’t believe that those PVs are the ones Shredder is >>using for analysis, and still play decent chess. >>What do you think? >> >> Jaime Benito
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