Re: [Bug-gnubg] rollout settings

[Nardy Pillards]

> Can anyone give a short explanation (or links) for the rollout parameters
:
>
> Full cubeless rollout without var.redn., with rotate rolls ????
>
> I have vague idea what  variance reduction is but never heard about
> rotate rolls.

(from previous post, JT):

gnubg will try to reduce the variance of the rollout by rotating the
first few rolls (depending on the numbers of trials) instead of
selecting random rolls.

For example, with 36 trials you'll get the following dice sequences:

trial  1: first roll 11, second roll random, third roll random, etc
trial  2: first roll 21, second roll random, third roll random, etc
trial  3: first roll 31, second roll random, third roll random, etc
trial  4: first roll 41, second roll random, third roll random, etc
[snip]
trial 36: first roll 66, second roll random, third roll random, etc

With 1296 trials, gnubg will rotate the first two rolls, and with 46656
trials gnubg will rotate the first three rolls, and finally with 1679616
trials gnubg will rotate the first four rolls. I didn't implement it for
60466176 trials. Let me know if it's needed :-)

In general, it's best to have the option enabled, and select a number of
trials that can be divided with 36: 36, 72, 96, 144, ..., 1296 etc etc.

Nardy