Beginner Exercise 232 / Solution

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[Diagram]

White kills.

W1 hits the vital point. Now a and b are miai for the kill...

Black should not play either a or b now, since both are utterly useless. However, either move can be used as a ko threat later. If black plays one and white ignores it because the ko is more important, black plays the other and saves the otherwise dead group.



[Diagram]

Continuation 1.

If Black makes an eye with B1, W2 connects outside, leaving Black with only one eye.



[Diagram]

Continuation 2.

If Black forms an eye with B1, White proceeds to falsify the other eye with W2 and W4.



[Diagram]

White failure.

Playing atari with W1 results in a ko, which is not the best result for White.



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