Beginner Exercise 156 / Solution

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[Diagram]

Black to win the race

Black wins with B1, a, or b. If Black a or b, White has a ko threat at c. With B1, White has a ko threat at b but c is not sente for White. Thus, Black may exchange c for d anytime (= 1 point sente).

So, I conclude B1 is best.



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