Small endgame problem

What is the best way for black to capture two stones?


A situation similar to this just came up in my game, and I thought it was worth sharing since the shape seems pretty common, but I haven’t thought about it before :slightly_smiling_face:

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?

If it’s about the number of ko threats one leaves behind then maybe A6. Otherwise I’m not sure of the difference between A6, A5 or A4. ( edit Whoops had the numbers backwards)

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Yep!

A4 or A5 leaves two ko threats, A6 only leaves one.

(The situation might change if black were less solid in the lower corner, so that something like A3 could be a ko threat for white)

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Very counterintuitive, I love it!

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