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Re: [Bug-gnubg] How strong is the lookahead?

From: Øystein Johansen
Subject: Re: [Bug-gnubg] How strong is the lookahead?
Date: Mon, 30 Mar 2009 22:37:26 +0200
User-agent: Thunderbird (Windows/20090302)

Erez wrote:
> I wanted to know what is the true addition of the lookahead to GNU so as
> a true lamer I set out a money game session between GNU playing expert
> and GNU playing Supremo. I thought to let them play until 64 points and
> see Supremo mop the floor with expert.
> I was never able to get to 64 because the software crashed somewhere in
> the middle (happened again on another computer), but still I was very
> surprised to find out that Supremo got only about 20% more points than
> Expert.

I would guesstimate a full 2-ply search to score about 0.052 ppg against
0-ply in a cubeless money session. This number is not pure guessing, but
comes from comparing benchmark results on the benchmark database set in
the training code.

(Of course this number has some uncertainty)

> So how much stronger really is Supremo than Expert? 

Harder to say without matching them against each other. (And you need
more than 64 points.)


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