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Local Ko Threat
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.
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. This is a copy of the living page "Local Ko Threat" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |