Re: [Bug-gnubg] Randomizing GNU-bg's first move.

[Joern Thyssen]

On Thu, Aug 28, 2003 at 01:43:01PM +0200, Nardy Pillards wrote
> 
> I think it is already there.
> Settings / Players ... Noise
> 
> If set to 0.005, gnubg will choose between the moves within 0.005.
> If Deterministic is checked, it will be 0.005 for every move, if 
> Deterministic is off, it will be between 0.0000 and 0.005 for every 
> move.
> 
> (someone correct me here if i am wrong)

Unfortunately it's not that simple...

Put very simple: the noise option add some "random" amount to the
outputs of the evaluation. 

If the noise options is, say, 0.1, gnubg will add between -0.1 and 0.1
to the wins, between -0.025 and +0.025 to gammons, and between -0.01 and
+0.01 to the backgammons, so the cubeless equity will have noise between
-0.135 and +0.135 (for non-jacoby money game).

The precise amount is calculated by some non-trivial algorithms.

gnubg will add the noise to all the equities calculated, and
subsequently choose a different move if the equities change
sufficiently.

Jørn

pgp4nqNIIJ_iO.pgp
Description: PGP signature