115NNNotcher
Keywords: Life & Death, Ko
There are several moves that live for Black (e.g. see 115NS Notcher), but white can make ko:
This sequence assumes Black can't escape using the stone. Of course, the ability of
to start the ko depends on the existence of the
stone.
Also note that even though it looks like White takes the ko first, Black has a free ko threat, so white must find the first threat.