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Eye
An eye is a liberty of a group which the opponent cannot remove. A false eye looks like an eye, but is actually not an eye. Sometimes, a large eye (nakade) is still considered only one eye. Eyes are a central concept in Go, since two eyes guarantee the life of a group. There is a lot of discussion on the definition of what is an eye and what is not. Here is a general eye definition meant for humans. There are also discussions of technical algorithmic definitions meant mainly for mathematicians and computers at eye definition discussion, where absolute precision is needed.
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This is a copy of the living page "Eye" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |