Re: [Bug-gnubg] Feature Request: Gnu to use rollouts for playing

[Christian Anthon]

Most of the code is already in place. Things to consider:

a) move filter - i.e. which positions to roll out
b) using GNURoller for plays and cubes in rollouts
c) efficiency of the current mt code for fast games in roll outs - we
lock all threads during accounting
d) variance reduction - my limited experience tells me that
variance/time is more or less independent of turning it on/off for 0
ply rollouts

Christian.

On Wed, Aug 19, 2009 at 2:53 PM, Ian Shaw<address@hidden> wrote:
>
> Over at bgonline there are some results of tests of eXtremeGammon
> against Gnubg.
> http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=46526#4652
> 6
>
> The XGRoller setting seems to clearly outperform Gnubg 3-ply over the
> 100 positions tested so far.
>
> I'd be interested in seeing how gnubg gets on with similar settings.
> With variance reduction off (as per XGRoller), I'm sure that gnubg is
> fast enough for the job.
>
> The command "set player 0 chequerplay type rollout" and all related
> commands for setting the rollout parameters exist, but are not
> implemented. Hopefully the code can be taken from the rollout code
> without too much trouble.
>
> I think that XGRoller has demonstrated that modern PCs are fast enough
> to perform such rollouts, which was not the case when gnubg was first
> coded.
>
> -- Ian
>
>
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