[computer-go] incremental liberty counts

[Rémi Coulom]

Don Dailey wrote:
> I am interested in the opinion of the group on maintaining information
> incrementally for liberty counts and perhaps stone counts.   Specially,
> how it might be done in the fastest possible way.
Two more remarks:

First, using redundant data scales better to larger boards. Your method 
without redundant data may work efficiently on 9x9, but I expect you 
could not keep up on 19x19, or even 13x13.

Second, please, tell us how fast you get with both methods.

Rémi