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Re: [Bug-gnubg] new contact net

From: Joern Thyssen
Subject: Re: [Bug-gnubg] new contact net
Date: Tue, 10 Jun 2003 09:21:01 +0000
User-agent: Mutt/1.4.1i

On Tue, Jun 10, 2003 at 04:56:41AM -0400, address@hidden wrote
> In a message dated 10/06/2003 09:53:00 GMT Daylight Time, address@hidden 
> writes:
> > I estimate that the luck analysis will double the time need
> > to play a match, 
> Interesting. Do you know this for sure or is that a guess?
> I ask because I'm always looking for ways to speed up analysis and don't 
> usually have interest in luck,  just errors.

A 0-ply luck analysis cost 21 0-ply evaluations, which is the same as a
0-ply chequerplay decision requires in average (assuming an average of
21 legal moves per roll). The cube analysis costs one 0-ply evaluation.

However, assuming you do a 2-ply chequerplay analysis the picture is
totally different. Assuming you, on average, analyse two moves on 2-ply
for each roll, you'll have close to 900 0-ply evaluations per roll for
the chequerplay analysis. The cube analysis is another 441 0-ply
evaluations, so the 21 evaluatiosn for the luck analysis is nothing
compared to 900-1350 needed for the cube and chequerplay analysis.

Conclusion: for 0-ply analysis the luck analysis costs a factor of 2,
but for the more common 2-ply analysis it's less than 5%.


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