RE: [Bug-gnubg] window size

[Øystein O. Johansen]

> I'm not convinced that one-sided rollout does
> anything useful at all. Changing the number of trials and
> pressing "Rollout" does not appear to do anything.

It's extremly fast!

> Do the numbers displayed come from the race databases,
> or an estimate from the race net? Does anyone know?
> I think Jørn coded it, but he's been inactive lately.

The one side rollout was coded by Joseph.

It rolls out out a race position and for each side, and stores
the distribution of rolls needed to get all men off. Combining
these two distributions for each side, just like the one side
bearoff db, gives the win probability.

OSR was used to train the race neural net.

> If the former, what purpose does the "rollout"
> button serve?

> If the latter, then it's just an estimate and not
> necessarily accurate. 

See how osr and 2ply compare here:
http://pages.quicksilver.net.nz/pepe/ngb/

OSR must still be considered a estimate, but it's usually
a really good estimate.

-Øystein


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