Rectangular six with leg in the corner

   
[Diagram]
Corner shape  

Black-to-move plays b or c; I have not worked out what ko threats those leave behind. After either of those moves, the only other thing left in the corner is the (double-)gote hane-connect.

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




Rectangular six with leg in the corner last edited by RickyDemer on October 8, 2018 - 20:50
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