Ambiguous Ko

  Difficulty: Expert   Keywords: Ko

Bill Spight: Some years ago I coined the term, sente ko, which seems to be catching on. But looking at this classic example, I realize that it is actually ambiguous, as in ambiguous position.

Ambiguous ko  

If White takes the ko she raises the local temperature from 1/3 to 7/9 by threatening to take again. If Black replies at B2 the temperature drops back down to 1/3. That means that this position is ambiguous, having both sente and gote properties.

Ambiguous ko example 2  

(As always, we assume that the framing stones are alive.) This example is plainly ambiguous, as W1 gains the same as B2, 1 2/3 points. It is not a sente ko because W1 does not raise the local temperature.

Ambiguous Ko last edited by Dieter on January 9, 2013 - 18:28
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