Author: Richard A. Fowell (fowell@netcom.com)
Date: 00:35:47 10/09/99
Go up one level in this thread
On October 09, 1999 at 00:12:56, Dann Corbit wrote:
>r2r2k1/pQBb3p/6p1/3Pb2q/8/4pPP1/PP4BP/R2R3K w - -
>
>Zarkov 4.0 32 bit was stuck on Bxd8 for about 2200 seconds {around 62 million
>nodes}, then made this choice:
>22.Bxe5 Qxe5 23.f4 Qb8 24.Qb3 Qxb3 25.axb3 e2 26.Rd2 Bb5 27.Bf3 Re8 28.Re1
>Rad8 29.Bxe2 Bxe2 30.Rdxe2 Rxe2 31.Rxe2 Rxd5
>with an eval of about +2.00.
>
>About 10 minutes into the analysis, it could see that Bxd8 was bad
>(eval -0.23) but it took a very long time to find a suitable alternative.
>
>Crafty seems to avoid Bxd8 right away. How do other engines do? Perhaps it is
>some sort of a bug.
>
>Also, I only seem to get about 28KNPS for Zarkov 32 bit. Is it a slow searcher,
>or do I have my machine configured improperly? (It's only a 300MHz PII on the
>machine w/ Zarkov 4).
Here are results on my 180 MHz Macintosh (7300, 604e)
for Chessmaster 4000, MacChess 5.01, HIARCS 7.0, Virtual Chess and Sigma Chess.
Chessmaster avoids the trap by 21 seconds,
and MacChess avoids the trap in a couple of minutes.
The other programs hadn't even SEEN the trap by the 10 minute mark.
r2r2k1/pQBb3p/6p1/3Pb2q/8/4pPP1/PP4BP/R2R3K w - -
saw avoid
Bxg3 Bxd8
(sec) (sec)
----------------------------------------
CM4000 15.4 20.4
MacChess 5.01 89 129
HIARCS 7.0 --- --- Still no clue at 10 min
Virtual Chess --- --- Still no clue at 10 min
Sigma Chess 4.02 --- --- Still no clue at 10 min
Here's the detailed MacChess 5.01 log:
08/01 00:06 723470| +417| Bxd8 Rxd8 f4 e2 Rd2 Bb8 d6 Re8 Re1
09/01 00:23 3115995| +418| Bxd8 Rxd8 f4 e2 Rd2 Bb8 d6 Re8 Qb3+ Kg7 Re1
10/01 01:29 11999098| +44| Bxd8 Bxg3 h4 Rxd8 Rd4 e2 Qb4 e1=Q+ Rxe1
Rb8 Qe7 Bxe1 Qxd7 Rxb2
10/02 02:09 17539053| +231| Bxe5 Qxe5 Re1 e2 b3 a5 Rac1 Rac8 Rxc8 Bxc8
10/03 05:44 48425340| +256| d6 Bxg3 Qd5+ Qxd5 Rxd5 Be6 Rd3 Bf5 Rb3 Bf4
Bxd8 Rxd8
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