[computer-go] f(score) instead of sign(score)

[Rémi Coulom]

Hi Jonas,

welcome to the list.

The idea of using f(score) instead of sign(score) is interesting. Long 
ago, I tried tanh(K*score) on 9x9 (that was before the 2006 Olympiad, so 
it may be worth trying again), and I found that the higher K, the 
stronger the program. Still, I believe that other f may be worth trying.

By the way, Olivier and Sylvain mentioned earlier on this list that they 
were using floating point in their tree data structure. So MoGo may be 
using a floating point function to estimate the score of a playout, 
otherwise there would be no reason to use floating point. But I may be 
guessing wrong. Maybe they can tell us ?

Rémi