Secondary Ko Threat

  Difficulty: Advanced   Keywords: Ko

A secondary ko threat is a ko threat that is not sufficient to win the ko, but large enough to gain compensation.

See: ko threat functions



Ko fight - White mistake  

B4 takes ko (black+circle). B6 fills ko at 1.

(Assume that the open areas are dame and out of play.)

Net result: Jigo.

Ko fight - W3 at black+circle  

B2 is a secondary threat, which White should ignore. Net result: White +1.

Each play in the ko gains 2 2/3 pts. on average. Move 5 gains 2 1/2 pts. on average, so the ko is only slightly larger. B4 gains 3 pts. on average, which is slightly larger than a ko move, but it is still in this case a secondary threat.

Secondary Ko Threat last edited by Dieter on January 9, 2013 - 18:48
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