Re[3]: computer-go: Eyes

[Jean-Pierre Vesinet <jvt@xxxxxxxxxx>]

	Richard L. Brown wrote:

> The key thing to note from the web site that Jean-Pierre quoted is that
> any
> surrounded space -- not just single points -- consists of what the rule
> above calls "eye points".  So if you surround five contiguous points with
> your stones, you have five of what the rule above calls "eye points", or
> what I would call a five-space eye.
> 
> Even if the opponent throws a stone into my five-space eye, I would still
> call it an eye.  It's an eye that happens also to have an enemy stone
> inside
> it, but that doesn't stop it from being an eye.  Even dead groups can have
> one eye; note that the rule above does distinguish between eyes and
> "territory" -- by use of the qualifier "alive".  I'll have to visit the
> site to see how they defined that, "alive".  Five bucks says it's
> circular.
> 
	IMHO the quoted '89 Japanese rule defining eyes, territory, dame and
seki only makes sense after dead stones have been removed. "Empty points"
actually include dead stones.

	On the subject of eyes, and as mentioned in previous posts, in order
to keep definitions simple the concept of region is a very useful one. I
also like Robert Jasiek's "lake" which is a nice name for a region.
Especially when the region is safe. Is it a literal translation of a
chinese, korean or japanese go-related word ?

	Jean-Pierre