Author: Jaime Benito de Valle Ruiz
Date: 09:04:35 12/21/03
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On December 21, 2003 at 10:08:43, Bob Durrett wrote: >On December 21, 2003 at 08:53:39, Jaime Benito de Valle Ruiz wrote: > ><snip> > >>because the final static >>position of the PV does not match the score is showing anyway > > >The idea that the score should match the final position of the PV is clearly >incorrect, IMHO. Well... for my engine I can assure you that it is! For Shredder's, if it gives a positive score for itself, but the PV goes kamikaze and looses its queen and another couple of heavy pieces, ending up in a hopeless position that not even a silly Qsearch can make up, the positive score makes little sense... I think. Have a look at the example I posted: The line shows that Shredder expects the other player to change his queen for a pawn (????) and no compensation at all, and the score seems close to zero! Obviously the PV is not showing what Shredder really expects. The theory that Shredder is extracting the PV from the hash tables seems completely convincing to me, especially because an old version of my engine ,that used a similar method, usually exhibited similar stupid PVs once in a while... but could beat me. > >My interpretation of the score has been that it is either an evaluation of the >position being analyzed or it represents an evaluation of the position that >would occur immediately after the recommended move is played. If the engine >"thinks" that the move is best, then the evaluation before and after the >recommended move is played would be the same, it seems to me. > >I agree that Shredder's "PV" is flawed and that is irritating. However, it >would be a bad mistake to assume that the moves of Fritz's PV are "good." > >Disclaimer: I am not a chess programmer but am a user of the programs. > >Bob D. > > ><snip>> Jaime Benito
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