Beginner Exercise 156 / Solution

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[Diagram]

Solution

Black wins with B1, x, or y. B1 is best, with two advantages over the rest:

1) White's play at a is not sente, and

2) the marked stones have more liberties in some continuations.

[Diagram]

Comparison 1

If Black chooses x in the above diagram, W2 forces B3 - it tactically affects the top side. For example, Black can't catch W4 because of W6! - Black can't play at a.

[Diagram]

Comparison 2

If Black chooses y in the first diagram, the same tactics occurs with more serious effect because White's corner has two liberties. Later, White a will be sente - White b next makes seki.



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