Beginner Exercise 140 / Hint

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[Diagram]

Black to play.

Please note that this is not a life-and-death problem, but an endgame problem. If Black has more ko threats than White, then Black cannot be satisfied by playing at a, allowing White b to secure the corner. (Exercise: Why White b?)


This is a copy of the living page "Beginner Exercise 140 / Hint" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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