124WS notcher

    Keywords: Life & Death, Shape
[Diagram]

124WS

This is a critical notcher. Black is alive. Anything weaker is unsettled though. If both corners of the notch are empty, the shape is alive too. To prove the statements: if White starts at the vital point a ...

[Diagram]

124WS

... B6 catches White in a connect and die. The exchange of W3 - B4 is futile. Black does not get shortage of liberties.


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