(No. 132: Nov. 2, 1998)
Elementary level: Answer
Black 1 is crucial. If White 2, Black lives with 3.
Elementary level: Wrong Answer
Black 1 is wrong. After White 2,
Black has no way but to create a Ko with 3.
Intermediate level: Answer
Black 1 is the vital point. If White 2, Black 3 is
crucial to live. If White 2 at 3 , Black plays 2 to live.
Intermediate level: Wrong Answer
Black 1 is wrong. White plays at the vital point 2 to kill Black.
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