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BasicDeathShapes

 

Two By Three Box
   

[Diagram]
Diag.: 2 kills

I thought I was Captain Smooth by making my little 2x3 box, but I didn't recognize the death that lay waiting with white's 2. D'oh!

Why does it kill?

[Diagram]
Diag.: Why 2 kills

At this point, the best black can do is to trap three in a row, which is dead. For the most part, once you've lost both 2-2 points, you're dead in the corner.

-- Scartol



Note that this only works because of damezumari that occurs in the corner. On the side, or in the middle this is alive as it is:

[Diagram]
Diag.: "Captain, it's alive!" - black has one extra liberty.


[Diagram]
Diag.: White creates a ko:

RMDow?: The same is true for 2x3 in the corner with 2 or more external liberties (black is alive). When there is exactly 1 liberty, the best white can do is to play a ko to create BentFourInTheCorner



This is a copy of the living page "Two By Three Box" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.