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InternalKoThreat
InternalKoThreats
LocalKoThreats
LocalThreat

Paths
SecondCourseOnKo

Referenced by
KoThreat
LossMakingThreats
ThereAreNoKoThrea...
StupidMoves
KoThreatPlayingOrder
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KarlKnechtelSKoStory
BQM31
BeginnerExercise9...
BlackSheepRengo2003
BeginnerExercise1...
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KanazawaAttempts88
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RogueKo
TFG9BlackUpperLeft
ChineseGoTerms
TFG9BlackUpperLeft2
ChemistryAndLife

 

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

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 the marked stone. 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.


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



Path: SecondCourseOnKo   · Prev: KoThreatPlayingOrder   · Next: LossMakingThreats
This is a copy of the living page "Local Ko Threat" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.