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Re: [computer-go] False Eyes
Christoph Vielhauer wrote:
A "cluster" is a set of connected black or white stones
Thus a cluster can consist of either black stones or white
stones or both black and white stones. I suppose "connected"
is meant to work via grid lines. Your cluster is not necessarily
maximal.
Is that what you have intended?
Two clusters are "linked", if they share at least one common region.
So if neither cluster is adjacent to any region, they do not
share any common region.
A "group" is a set of linked clusters.
Is it maximal?
Do you mean pairwise linked or recursively linked or
do you just form a set and do not care about recursive
linkage? (I.e. must a group consist of mutually connected
intersections?)
> I consider "life or death" a property of a group.
Even if it contains black and white stones? Which
types of such life or death do exist then?
When looking for eyes of a group, all regions belonging to this group are candidates.
What is an "eye"? What is "belonging to" in this context?
Now the question: Which regions are real eyes and which regions are false eyes?
I propose this rule:
1. A region having only one cluster is a real eye.
2. A region having more than one cluster is a real eye, if any two of its clusters are linked via another region. (the region in question does not count).
3. A region of size >3 is a real eye in any case.
What would you say. Are these rules correct?
As long as you basic terms are ambiguous, what is the
purpose of inventing any "rules"?
***
If you need to distinguish false from real eyes, then use
unambiguous definitions like in the Japanese 2003 Rules
(on my webpage) and the eyes, group, seki, and independently
alive definitions based on those (published at rec.games.go
almost a year ago, Subject: Group, Seki, Eyespace: Definitions).
First determine all the false eyes among all the eyes. All
other eyes you can call real eyes. You need to introduce
obvious characteristics of false eyes.
***
Please note that I do not read this list from July 23 to
August 7 because of attending the EU Go Congress.
--
robert jasiek
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