Rectangular six with leg in the corner

   
[Diagram]

Corner shape

This is a shape between a walkie talkie seven and a rectangular six in the corner.

In both of these, Black can easily live if he has sente. If White has sente, the vital point in the former is a, in case of no outside liberties, and in the latter is b or c depending on whether thereare still outside liberties.

So which is it here?

[Diagram]

Ko

[Diagram]

Dead

Shortage of liberties at a

[Diagram]

Life

[Diagram]

Dead

Expanding the eye space does not help

[Diagram]

Ko




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