113WS Notcher

    Keywords: Life & Death
[Diagram]

113WS

This is an unsettled critical notcher.

[Diagram]

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.

[Diagram]

Dead

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

[Diagram]

Killer?

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


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