Author: Robert Hyatt
Date: 06:36:25 11/23/00
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On November 23, 2000 at 06:36:26, Shep wrote: >On November 22, 2000 at 16:45:40, Jarkko Pesonen wrote: > > >>Another question about INCPLY 60 define in chess.h >>Can 60 be changed to some other value without destroying the search totally i.e. >>is some modification needed to make work reasonably. Is the value 60 >>educated guess, result of years of work, or can any value work? >> >>40 seem to make it faster to move to another ply level >>100 makes it almost stall. I missed the above. changing this should not hurt anything, except that if you make it too big, the "draft" field in the hash table will overflow and cause problems. If you change incply, you should also change the search extension values accordingly. IE one reply should become 75 rather than 45 so that is stays at 3/4 of a ply. Etc. > >I've seen the same behaviour in Shredder where you can set selectivity >(==MAXPLY) up to 99 and it also takes much more time for each ply the higher you >set this value. My guess is that either some extensions "go wild" at such a high >depth or the internal data structures become "defragmented" (in lack of a better >term) and things run outside the CPU cache or whatever. > >--- >Shep
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