(No. 106: May 4, 1998)
Elementary level: Answer
Black 1 is the vital point. After White 2,
Black 3 wins the capturing race.
Elementary level: Wrong Answer
Black 1 fails. White 2 is the vital point and gets a Ko.
(This is the same shape as the previous problem.)
Intermediate level: Answer
Black 1 is the vital point. After White 2, Black plays 3 to 7.
White cannot capture the Black stones because White is short of
liberties. White dies. If White 2 at 3, Black 2 kills White.
Intermediate level: Wrong Answer
Black 1 allows White to play at the vital point 2 and live.
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