Beginner Exercise 156 / Solution

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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.

togo: And even better: If I see this correctly, White's ko threat at b only kills, if there is a white stone to run to (Although unanswered it weakens Black's stones considerably.).

Beginner Exercise 156 / Solution last edited by togo on October 26, 2012 - 22:46
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