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Re: [Bug-gnubg] RE:Why is odd ply equity always lower?

From: Joern Thyssen
Subject: Re: [Bug-gnubg] RE:Why is odd ply equity always lower?
Date: Tue, 10 Jun 2003 12:32:28 +0000
User-agent: Mutt/1.4.1i

On Tue, Jun 10, 2003 at 01:11:52PM +0100, Ian Shaw wrote
> Since a 1-ply eval is just 21 0-ply evals, it appears that GnuBg is
> consistently overvaluing the equity for the side on roll.

Not necessarily. gnubg may just be overestimating one side. For example,
it may overestimate the side playing against a holding game. The 1-ply
evaluation is averages of equities for the player having the
high-anchor, so it's not symmetric unless it's a mutual holding game.

For any of your positions, try with the opponent on roll, and calculate
the 0-ply, 1-ply, 2-ply, etc. equities. If they exhibit the same pattern
then you may have a point.


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