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Eye liberties if almost-almost filled
  Difficulty: Advanced   Keywords: Life & Death, Tactics, Theory

The number of effective liberties of an almost-almost filled eye is the sum of the first N natural numbers (one for each filling stone) plus two (for the unfilled spots). The filling stones, of course, have to form a killing shape and must be extendable to another:

[Diagram]
(0) + 2 = 2



[Diagram]
(0 + 1) + 2 = 3



[Diagram]
(0 + 1 + 2) + 2 = 5



[Diagram]
(0 + 1 + 2 + 3) + 2 = 8



[Diagram]
(0+1+2+3+4) + 2 = 12




Author: Robert Pauli



This is a copy of the living page "Eye liberties if almost-almost filled" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.