[Computer-go] Exploration formulas for UCT

[Aja]

   Hi, Yamato,

> I guess it should be not "* 3000" but "/ 3000".
>
> Zen also uses this type of formula, but the constant value is rather
> small. I use 400 for the latest version of Zen.

   If you are right, then it makes sense. For "/3000", bias is around 0.009.
   I use 600 for Erica, similar to Zen.

   Aja