Author: Ed Schröder
Date: 09:51:28 03/03/00
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On March 02, 2000 at 18:28:31, Robert Hyatt wrote: >On March 02, 2000 at 05:12:10, Ed Schröder wrote: > >>On March 02, 2000 at 04:45:46, Jeremiah Penery wrote: >> >>>On March 02, 2000 at 03:58:13, blass uri wrote: >>> >>>>On March 02, 2000 at 01:42:43, Ed Schröder wrote: >>>> >>>>>Nowadays programs hit a deeper ply depth than DB. See the log files >>>>>on the IBM site. >>>>> >>>>2)I understood also from hyatt's posts that you need to add 3-4 plies to the >>>>depth in the logfiles of the IBM site to get the real depth. >>> >>>Actually, it's more than that. For this search: >>> >>>depth score time PV >>>11(6) 48 T=204 Qa7... >>> >>>You have a depth of 11 PLUS *six* plies of hardware depth. So a total depth of >>>_17_. That seems to be about the average depth of most of their searches. >>>That's a bit beyond PC programs. And we know they were extending probably more >>>than PC programs also. >> >>Is there an official statement of this? >> >>It's all not so clear. >> >>We also don't know which or how many extensions are done. The same >>applies for most chess programs BTW. We can only guess. >> >>Ed > > >This is official from the DB team, two different members confirming the >notion that (x) is additional plies searched only by the hardware. I told >vincent for several years that when they said "10" plies they meant something >different than he did. This was common knowledge for deep thought. I just >never thought to re-state it since it was mentioned so many times at the ACM >events they participated in. > >11(6) suddenly becomes frightening, doesn't it? :) Maybe, maybe not :) Nowadays chess programs have a branch factor of 2-2.5. DB has a branch factor of 4. Every doubling in PC speed we are almost hitting one ply deeper, coming closer and closer and eat the thing for dinner in the end :) Alarming doesn't it? :) Ed
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