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Re: [gnugo-devel] PATCH: Marginal eye points with opponent stones in eye

From: Gunnar Farneback
Subject: Re: [gnugo-devel] PATCH: Marginal eye points with opponent stones in eyes.db
Date: Sun, 25 Nov 2001 09:34:03 +0100
User-agent: EMH/1.14.1 SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.3 Emacs/20.7 (sparc-sun-solaris2.7) (with unibyte mode)

Inge wrote:
> Well, the subject says it all.  Here is a patch that implements
> support for marginal eye points with opponent stones in eyes.db.  The
> change was surprisingly simple to make, but the big job is to get all
> the patterns that use it correct.  I chose the character '$' for it.
> I would have preferred '#', but that was already taken by the comment
> character. 

I think 'Y' would be a good alternative.

Dan wrote: 
> Could you give an example where this is needed?

The two most interesting cases are covered by test cases
optics:312,325. Currently those are handled by linear_eye_space().
After Inge's patch all the 300+ lines of code in linear_eye_space()
can be replaced by eye patterns.

This has been discussed previously, see

The question whether we have all needed patterns in eyes.db should
today be easier to settle thanks to the test_eyeshape() functionality.
This is currently limited to closed eyeshapes, but once it works with
marginal eyespaces we should be able to get definite answers.


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