Re: computer-go: Second Order Liberties

[Darren Cook <darren@xxxxxxxxxxxxxxx>]

> Many Faces does not use the concept of 2nd or higher order liberties.
> 
> Many programs use higher-order liberties as a measure of how surrounded
> a group is.  I prefer to use influence, measuring if there is a path to
> another strong group.

Do you use that influence idea inside tactical search as well? If so,
did you update the influence map after each node in the search, or just
use the influence that existed at the root node?

I had good results using both 2nd and 3rd order liberties to prune and
sort moves in tactical search. (with secondary libs allowed to be the
primary lib of an opponent).

Darren

> >noticed in the GnuGo 2.6 ... that second order liberties cannot
> >exist on an opponent first order liberty.  Is this the way everyone does it?
> >What is the reasoning behind this?