Eye space a term coined by Howard Landman. Informally, it is the space available for a group to make an eye or eyes. In practice, eye space is terrain almost or entirely surrounded by a player. In tsumego problems, it is often important to reduce the eye space from outside, perhaps by a hane, for example. (See Futokoro.)
Eye space may include points within an existing eye, depending on its eye shape. Eye shapes can be alive, dead, unsettled (killable with one move) or killable with more moves. See
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