Author: James T. Walker
Date: 15:08:45 11/09/98
Go up one level in this thread
On November 09, 1998 at 16:29:23, Dr. Gregor Overney wrote:
>Last weekend, I was running some tests with Crafty 16.0 and Crafty 15.20. After
>10 games, Crafty 16.0 is leading 1:0. This is indeed only statistical noise.
>
>Of course, I made sure that 15.20 and 16.0 are compiled with the SAME
>optimization levels using exactly the same compiler (VC++ 6.0).
>
>Gregor
I have been running test also. I put in a given position and compare the
results after equal search times. This I think is the best comparison. There
is a definite difference in the two programs. I'm getting about 11 knps faster
search with Crafty16.0. In the following test position:
1rr5/p1qn1k2/2n1p1p1/1p1p3p/3P3P/2P5/PP1Q1PP1/1BR1R1K1/ w (If I got the FEN
wrong it is from the Nov Chess Life page 36-top right diag.) The data after a
200 second search looks like this:
Crafty 16.0-- Nodes 31,763,620 (Search time 3:20)
NPS 158,493
Evals 3,592,678
Score= Draw
1.Bxg6,Kxg6 2. Rxe6+ Kf7 3. Qh6 Nf8 4. Rf6+ Kg8 5. Qg5+ Kh8 6.Qxh5+ Kg7
7. Qg5+ Kh8 8. Qh5+
Crafty 15.20- Nodes 29,700,817 (Search time 3:21)
NPS 147,713
Evals 4,135,492
Score -0.66
Same variation.
Despite the increased speed by Crafty 16.0 it is losing to Crafty 15.20.
There were no Probes involved in the search.
I also saw crafty with K,Q,PP vs a K sac the Q for nothing just because it has
the KPPK tabelbase and knew it was a win. This looks very strange.
Jim Walker
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