![]() ![]() Kb: Robert, let me give two definitions of an eye. If you don't do it in 20 hours without any mistake, then you will never succeed. Should be easy enough if only you have understood those rules and can write well-defined definitions. I.e., you need a two-stage iterative application of its concepts. If you want an "eye" definition for any position interpreted as a current game position, you need to "copy and paste" the (b) terms for a continued played game to end in a final position that is only then scored a la Japanese 2003 Rules. Elsewhere (, etc.), I have given definitions of basic go terms like "eye" or "seki" for any position as if it were a scoring position. However, the following is necessary: Either you presume those rules or you a) presume some other rules, b) define "hypothetical-sequence", "hypothetical-strategy", "force" or analogous terms, and c) apply all that. From those rules' methods, defining eye, eye space, etc. First I suggest you read and understand, version 35a| ]. RobertJasiek: After 5 years of absence from this page, I come back and you still have not stated a general definition of "eye". This definition is immediately applicable to go on an arbitrary graph (the concept ‘enclosed’ does not depend on a concept of inside/outside).An eye in the stomach does not provide an true eye for the surrounding group, as the enclosed eye is not adjacent to any of its chains.This is different from the way in which eyes are usually introduced, which also omits the adjacency condition. Eyes are defined for chains rather than for groups and two are needed for each chain rather than for the group as a whole.A set of points is enclosed by ``S`` if it is not adjacent to any other point of colour ``C``.If suicide is allowed, then any opposing stones in ``E`` must also all be adjacent to ``H``.This is known in Benson’s Definition as a ‘black-enclosed region vital to a black chain’ (if ``S`` is black).An eye of a chain ``H`` enclosed by ``S`` is a maximal strictly connected set ``E`` of empty points and opposing stones ‘enclosed’ by ``S`` in which every empty point is adjacent to ``H`` (is a liberty of ``H``).A chain is (as usual) a maximal strictly connected set of stones of the same colour ``C``.A set ``S`` of ‘ chains’ of a given colour ``C`` is unconditionally alive if every chain in it has two ‘eyes’ ‘enclosed’ by ``S``.Using the term ‘eye’ where they speak of a ‘vital region’: This definition is adapted from the materials cited above, ![]()
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