(No. 96: Feb. 23, 1998)
Elementary level: Answer
Black 1 is the vital point. After White 2,
Black kills White with 3 and 5.
Elementary level: Variation
If White 4, Black plays 3 and 5 to kill White.
Elementary level: Wrong Answer
Black 1 allows White to play on the vital point 2 and live.
Intermediate level: Answer
Black 1 is crucial. After White 2,
Black 3 captures White's two stones.
Intermediate level: Variation
If White 2, Black 3 wins the race.
Intermediate level: Wrong Answer
Black 1 fails. White wins with 2 to 4.
Instead of White 2, White can also play at 3 and win the race.
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