Eye space
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Eye space[1] is, informally, the space available for a group to make an eye or eyes. In practice, eye space consists of points on the board almost or entirely surrounded by a player. In tsumego problems, it is often important to reduce the eye space from the outside, for example by a hane. (See Futokoro.)
In the early stages of a game, a group's eye space is provided for by the group's base, giving eye potential. For eye spaces that are effectively surrounded by one colour, their quality depends on their eye shape.
See also
[1] Eye space is a term coined by Howard Landman.
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