Author: Robert Hyatt
Date: 09:26:37 08/26/99
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On August 26, 1999 at 10:16:06, Shep wrote: >On August 25, 1999 at 10:56:36, Robert Hyatt wrote: > > >> >>Unfortunately, Crafty won't do what he wants. It plays wide-open only, although >>I have added some controls to allow this to be controlled. And several are >>working on 'personalities' for Crafty that will tone it down. But at present, >>it is "all" or "nothing" which is not good for < 2000 players, perticularly. >> >>Although if you have an old 386/16 it might be pretty weak. :) > >Isn't there an easy way of artificially slowing Crafty down? >Some loop that could be executed to wait N/100th of a second before a routine is >called? > >I haven't dived into the Crafty source, so I don't know if there is a point that >is guaranteed, say, to be processed every Nth cycle or so; this would then be >the perfect place for a waiting loop. >(Otherwise you could just count nodes and run a loop every N nodes.) > >Crafty 9.29 on my old Amiga (68040-25 MHz) has an LCT 2 score of 2020 (3 MB >hash, about 800-1000 nps) and plays at about 1900-2000 ELO on that machine. >If there was a way to slow Crafty down to 1/100th of a P6-200, that would >already do it I guess. > >Even better: upon init, Crafty could run a small benchmark to roughly determine >current CPU speed compared to a reference system, calculate some numbers (based >on key relations such as "100 Knps = 2400 ELO, 1 Knps = 2000 ELO) and then know >where to set the loop, according to a command "ELO 1800" or "ELO 2000"... > >--- >Shep the reason I don't like this approach is that slowing it down makes it play tactically worse, obviously, but it isn't a dumb program positionally either. How many players do you know that will fall into a mate in 2, but which understand backward, weak, passed, outside passed pawns, blockading, king safety, etc... IE you get a tactical dummy, but a positionally aware engine.. and it just doesn't 'feel like' a 1500 player... The new eval scaling options give rise to the possibility of having various personalities (several are fiddling with this now) with the ability to tone down extensions, and tone down eval components, so that it can be dumbed down in sort of a uniform way...
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