Author: Dave Gomboc
Date: 00:13:20 05/23/99
Go up one level in this thread
On May 22, 1999 at 23:22:04, Jeremiah Penery wrote: >On May 22, 1999 at 04:34:48, Dave Gomboc wrote: > >>On May 21, 1999 at 21:40:57, Dave Gomboc wrote: >> >>>First, the (famous) game. >>> >>>Glucksberg - Najdorf, Warsaw 1935. >>> >>>1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5 5.Nf3 Nf6 6.Bd3 Bd6 7.O-O O-O 8.Ne2 Nbd7 9.Ng5 >>>Bxh2+ 10.Kh1 Ng4 11.f4 Qe8 12.g3 Qh5 13.Kg2 Bg1 14.Nxg1 Qh2+ 15.Kf3 e5 16.dxe5 >>>Ndxe5+ 17.fxe5 Nxe5+ 18.Kf4 Ng6+ 19.Kf3 f4 20.exf4 Bg4+ 21.Kxg4 Ne5+ 22.fxe5 h5# >>> >>>Now for the questions: >>> >>>How long does it take for programs to... >>> >>>1) decide to play 15...e5! >>> >>>2) assess 15...e5! as about +4 for Black (roughly the score if White had played >>>21.Ke3 and dropped his queen. The interpolation of 16.cxd5 cxd5 doesn't >>>substantially change matters.) >>> >>>3) decide to play 13...Bg1! (it's better than ...Bxg3) >>> >>>4) assess 13...Bg1! as about +2 for Black (up two pawns). >>> >>>Dave >> >>I just went for "the big enchilada" and skipped over 1 and 2 for now. I cleared >>out position.bin and position.lrn, and set Crafty thinking on Black's 13th move. >> Here's what I get on my dual PII-300: > ><snip> > >>An hour was long enough, the hash table was probably swamped. I will try to >>double it in size to 96M and run it overnight. >> >>Dave > >Ack! Sorry for the duplicate post - I accidentally submitted before typing. :P > >Anyway, the hash table was certainly full by then, but a full hash table doesn't >seem to hurt Crafty in any noticeable way, like it hurts Fritz, for example. I >run with only 12MB hash, even for overnight analyses, and the results are almost >identical when I run with larger hashes. > >Jeremiah I get the feeling that Fritz doesn't use a good hash table replacement scheme, period. Nobody else needs the kind of RAM I hear quoted for Fritz. Of course, not spending time computing if and how to replace means spending more time analysing, so if you have the RAM... Dave
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