(No. 89: Jan. 5, 1998)
Elementary level: Answer
Sacrificing a stone with 1 is the key to win
the race. Black wins with the moves to 5.
Elementary level: Wrong Answer
Black 1 fails. After White 2 there is
no way that Black can win the race.
Intermediate level: Answer
Black 1 is crucial to live.
If White plays 2 to 6, Black lives with 7.
Intermediate level: Wrong Answer
Black 1 fails. White kills Black with 2 to 6.
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