113WS Notcher

113WS  

This is an unsettled critical notcher.

Alive  

Black can live by playing at the vital point. Anything else is dead.

If the two circled stones are exchanged (113SW) or removed (113NN), the same holds.

Dead  

White can kill the same way, leaving no ko threat.

Killer?  

As an amusing side question: which of the points here are killer moves for White too?