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CriticalNotchers

 

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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(OC) 2003 the Authors, published under the OpenContent License V1.0.