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CriticalNotchers

 

113WS notcher
    Keywords: Life & Death

[Diagram]
113WS

This is a critical notcher. Black can live by playing at the vital point a. Anything weaker is dead. If the two corner stones' colors are inverted or if both are empty, the same holds.

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


[Diagram]
113WS


This is a copy of the living page "113WS notcher" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.