TsumegoFromGames138/Solution

Sub-page of TsumegoFromGames138
[Diagram]

Black to play & kill the upper right group

B1 is necessary to prevent White from forming a ko. After W2, B3 is the vital point: White can't play 5 due to shortage of liberties, and it becomes a false eye. If white plays any other move after B1, black plays at W2.


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