115NN Notcher

    Keywords: Life & Death, Ko
[Diagram]

115NN

Unsettled: There are several moves that live for Black (e.g. see 115NS Notcher), but if White starts, it's ko.

[Diagram]

White makes ko

This sequence assumes that B4 neither threatens to escape nor to build an eye, and, of course, the ability of W9 to start the ko depends on the existence of white+circle.

[Diagram]

usually no internal threat

Also note that even though it might look like White could use W7,B8 as a local threat, that would instead let Black use W7 as a threat to save most of Black's stones.


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