Beginner Exercise 48 / Solution

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Solution.

W1 puts a black stone in atari. The only defence for Black is to set up a ko at B2.

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Variation 1.

If B2, White connects underneath at W3. Black is totally dead.

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Variation 2.

Same as variation 1.

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Variation 3.

B2 prevents White from connecting W1 to the exterior stones, but W3 kills Black easily.

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Failure

W1 allows B2 to makes two eyes. There is no snapback at W3.

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Continuation

EthrDemon?:Can't W1 force a ko anyway as Black cannot connect at a?

MrTenuki: Nope, there is no ko here:

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Continuation

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Continuation

Black simply sacrifices the marked stone to live.

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...and black is alive.

(In fact, playing out W1-B2-W3-B4 immediately would be wasting two ko threats.)


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