BeginnerExercise165/Attempts

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One thing I looked at, as an alternative if White descends:

[Diagram]

Black to kill

Now white a is self-atari, and if White b, Black c catches the stones in a snapback. (White can capture black c, but then black plays at d and it's not really a ko because there's no eye there.) Does it still kill, or did I miss something?

B3 is wrong here: W4 at b lives. There's no snapback.


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