approach liberty

   

The approach liberties of a group is the minimal number of the attacker's excess approach plays necessary for removal. [1]


[Diagram]

approach liberties

The white semeai string hast 2 while the black semeai string hast 3 approach liberties.

Timm(10k): Hi Robert. I do not understand this page. According to the definition given, I feel like black has one approach liberty and white doesn't have any. Thus the black group would have two primary and one approach liberties. Am I wrong ?



[1] The definition follows that one in the book Capturing Races 1.


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