two by three corner

   
[Diagram]

Two by three in the corner

This, like the nakade, is a false seki - it looks like a seki but isn't. However unlike the nakade it depends on the enclosing stones having no outside liberties.

The exact position of the marked liberties can vary. There are 15 possibilities, all having in common that black is able to make a 2 x 3 rectangle shape.


This is a copy of the living page "two by three corner" at Sensei's Library.
(OC) 2023 the Authors, published under the OpenContent License V1.0.
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