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From: mclure@Sri-Unix.arpa
Newsgroups: net.chess
Subject: Belle/Blitz sacrifice
Message-ID: <1860@sri-arpa.UUCP>
Date: Wed, 11-Jul-84 02:49:00 EDT
Article-I.D.: sri-arpa.1860
Posted: Wed Jul 11 02:49:00 1984
Date-Received: Sun, 15-Jul-84 09:58:38 EDT
Lines: 29

The Belle/Blitz sacrifice mentioned in an earlier message
was made in the following position with Black (Belle) to
move:

	BR ** BB ** -- BK -- BR
	BP BP BP BP BQ -- BP --
	-- ** -- ** -- ** BP **
	** -- BB -- ** -- ** --
	-- ** WB BN BN ** -- **
	** -- WN -- ** -- ** --
	WP WP WP WP -- WP WP WP
	WR -- WB WQ ** WR WK --

Just out of curiousity, I handed this position to my faithful Prestige
and put it in "infinite" search mode where it just keeps searching
deeper and deeper to see how long it would take to find the solution.

Presumably Belle found it in a reasonable amount of time, say below
5 minutes, because it was playing under tournament time controls.

Note that Prestige is much, much slower than Belle obviously. It
runs on a tiny 4-mhz 6502. Still, the Spracklens have been able to
come up with a nice little program that can play good chess.

It took Prestige 57 minutes to find Belle's move: Rxh2!
This was a 6-ply search and Prestige felt it was 2.67 pawns ahead after
Rxh2. The principal variation is: Rxh2, Nxe4, Qh4, Ng3, Qxg3, Bd5.

	Stuart