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Half Eye
A half eye is either an eye or no eye, depending on who plays first.
The marked point is a half eye for black, because if he plays first, it becomes an eye.
White can remove the eye if she plays first. So the result of this game is
(This is denoted { 2 | 1 } in Combinatorial Game Theory, I believe) -- JanDeWit
BillSpight: See "Eyespace values in go" by Howard Landman:
JanDeWit: Another nice reference is Martin Mueller's Ph.D. thesis "Computer Go as a Sum of Local Games: An Application of Combinatorial Game Theory" which can be found at
This is a copy of the living page "Half Eye" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |