I'm writing up some "how to play Go" flyers and and want to make sure I'm being precise. How is this for a definition of a [single-point] eye?
An eye is a vacant point, surrounded [orthogonally] by stones of the same color, that can only be filled by simultaneously capturing all of the surrounding stones. Note that this is a "real" eye, not a "pseudo" or "quasi" eye as we often use in Monte Carlo search. Also, because these are rules for beginners, I'm only interested in one-point eyes. Under AGA (and, I think, Chinese) rules, confused players can always keep going until all eyes are one-point eyes. I *think* this definition works regardless of whether adjacent blocks have one or two eyes. (If filling is always illegal, it certainly requires capturing all of the surrounding stones.) Is there a horrible flaw in my definition? -- Peter Drake https://sites.google.com/a/lclark.edu/drake/
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