Local Ko Threat

  Difficulty: Intermediate   Keywords: Ko, Go term

Chinese: 本身劫 (ben3 shen1 jie2)
Japanese: ソバコウ (soba-kō, "ko (threat) nearby/at the side"),
近所コウ (kinjo-kō)
Korean: 자체팻감

A local ko threat also known as an internal ko threat is a ko threat which cannot be ignored because the follow-up would make winning the ko irrelevant either by killing (Example 1) or saving (Example 2) the stones over which the ko is being fought. This kind of threat should therefore be played before any other kind, the exception being when it is a loss-making threat. If your opponent has a local threat, it will be to your advantage to remove it, if possible, before the ko fight begins; see an example of removing a local threat.

Examples

[Diagram]
Example 1  

Black is playing ko for the life of his corner group. He just captured the ko with black+circle. The point a now is a local ko threat for White. Black must answer at b and let White retake. If Black ignores her threat and connects, White will kill the black group with b.

[Diagram]
Example 2  

Black is fighting a ko for the life of his group. When White takes the ko with white+circle, Black can atari two white stones with a as a local ko threat.

See also


Local Ko Threat last edited by PJTraill on December 28, 2018 - 00:12
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