Answers
(No. 117: July 20, 1998)
Elementary level: Answer
Black 1 is crucial to get a Ko. If White 2 at 3, Black plays 2. Black lives and White dies.
Elementary level: Wrong Answer
Black 1 is wrong. White 2 kills Black.
Intermediate level: Answer
Black 1 is the vital point. After White 2, Black wins with 3 to 7.
Intermediate level: Wrong Answer
Black 1 allows White to get a Ko with 2 and 4.
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