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Re: [Bug-gnubg] new contact net

From: Nis
Subject: Re: [Bug-gnubg] new contact net
Date: Tue, 10 Jun 2003 11:47:39 +0200

--On 10 June 2003 09:21 +0000 Joern Thyssen <address@hidden> wrote:

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.

And furthermore, most (all?) of these evaluations will be cached from previous 2-ply evaluations - right?

My standard rollout settings for some time has been 1-ply with variance reduction, for this reason. I haven't timed it, but I believe this is almost as quickly converging as 0-ply (with respect to std err).

Nis Jorgensen

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