Disclaimer: I've lost my interest in backgammon a long ago, so ... On 22 August 2015 at 00:12, Philippe Michel <philippe.mich...@sfr.fr> wrote:
> > If noise is added to the evaluations GNU Backgammon will take a Box Müller > transform of a point in the unit circle and add to each possible outcome > probability. This means that the addition is random, but distributed so > that it's more likely to have an noise addition close to zero than a noise > addition close to the limit. The noise addition is limited to the number > you put into the noise field in the dialog box. > > If you check the box Deterministic noise, the noise added to each > evaluation will be based on a sum of the bytes in the hash of the board > position, which (by the central limit theorem) should have a normal > distribution. In that way you will always have that same noise amount to a > position, since the noise added to the evaluation is only depending on the > position itself. > Of the two, I think the non-det one is the one I'd keep: at any rate it's the one closer to my idea of noise. I may see why a det-noise can be handy, but as the non-det noise actually uses gnubg RNG, it's not really non-det: if needed, you can make it (kind of) det giving it its own RNG instance with a seed, no ? MaX.
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