Author: Robert Hyatt
Date: 06:43:15 04/25/01
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On April 25, 2001 at 04:30:11, Alvaro Jose Povoa Cardoso wrote: >Does Crafty use fail-soft, fail-hard or a mix of the two? >From the source code I understand that is a mix between the two. >In a fail high it returns the higest score instead of BETA so this is fail-soft. >In the hash table probing it adjusts ALPHA and BETA in a fail-soft manner. >But in a fail low it returns ALPHA so this is a fail-hard. Not quite. It first sets alpha or beta to the bound from the hash table, so it is still fail-soft. _BUT_, when I fail high or low at the root, I do not use this new bound to set the bound for the next search. I did fail-soft as it was needed when I played around with mtd(f) a couple of years ago... I see no benefit to a normal PVS search. >I'm I correct? > >Thank you >Alvaro Cardoso
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