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Subject: Re: Stunning sacrifice, challenge to computers.

Author: Ernst A. Heinz

Date: 14:19:26 04/06/00

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On April 06, 2000 at 16:59:30, José de Jesús García Ruvalcaba wrote:

>[D]r2r1b2/3b1k1p/2p2pp1/p3n3/R3NNP1/7P/PPP5/1KB1R3 w - - 3 30
>
>	Black intended to play c5 followed by Bc6, but white's move came like
> a shower of cold water: 30. Nxf6!  The game continued 30... Kxf6 31. g5+ Kf5
> 32. Nd5! and white won brilliantly.
> Which programs are able to play these brilliant moves showing a score of at
>least one pawn up?

"DarkThought WCCC'99" switches to 30. Nxf6 with a positive score of +0.75
in iteration #11 after 1:49 min. But it prefers 31.. Kf7 rather than
31.. Kf5 as the best response for Black (see below).

00:01:00 11.01 g5 Bb4 Re2 c5 Nxf6 Bxa4 Rxe5 Rd1 N4d5 Bd2 =0.65 #20658291
00:01:49 11.23 Nxf6 Kxf6 g5+ Kf5 Nd5 Bd6 Rf4+ Ke6 Nb6 Rab8 >=0.66! #36770321
00:02:14 12.01 Nxf6 Kxf6 g5+ Kf7 Rxe5 Bb4 a3 c5 axb4 Bxa4 =0.75 #45412101
00:04:01 13.01 Nxf6 Kxf6 g5+ Kf7 Rxe5 Bb4 a3 c5 axb4 Bxa4 =0.86 #82483712

=Ernst=

P.S.
WWW pages of "DarkThought" at URL
http://supertech.lcs.mit.edu/~heinz/dt/.



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