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Aliases (info)
InternalKoThreat
InternalKoThreats
LocalKoThreats
LocalThreat

Paths
SecondCourseOnKo

Referenced by
KoThreat
LossMakingThreats
ThereAreNoKoThrea...
KoThreatPlayingOrder
StupidMoves
SubtlePointAboutA...
4463Enclosure
SGFAtSLDiscussion
KarlKnechtelSKoStory
TFG9BlackUpperLeft
BeginnerExercise9...
RogueKo
HolIgorNotesOnKo
ChineseGoTerms
KanazawaSolution22
SolutionToJfc001
BeginnerExercise1...
BQM31
KanazawaAttempts88
KanazawaSolution70

 

Local Ko Threat
Path: SecondCourseOnKo   · Prev: KoThreatPlayingOrder   · Next: LossMakingThreats
    Keywords: Ko, Go term

A local ko threat (or internal ko threat) is a ko threat that cannot be ignored, because ignoring it makes winning the ko useless. This kind of threat should therefore be played before any other kind.

[Diagram]
Example

In this diagram, Black is playing ko for the life of his group in the corner. Black has just captured the ko with BS. The point a is now a local ko threat for White. If Black ignores this and connects the ko, White will play b, killing the black group. So Black must play at b himself to avoid this. White can now retake the ko.



Charles Matthews I prefer 'local ko threat' - there are certainly cases in capturing races where internal ko threats would be external, which is pretty confusing.

Bill: I agree with Charles. A local threat is not necessarily internal.


I have put a clear-cut example of why you sometimes delay local threats at loss-making threats.


Japanese is "soba-kou", literally "next-to ko", for "ko (threat) (right) next to (the ko fight itself)."



Path: SecondCourseOnKo   · Prev: KoThreatPlayingOrder   · Next: LossMakingThreats
This is a copy of the living page "Local Ko Threat" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.