(No. 380: Aug. 4, 2003)
Black 1 is crucial.
If White 2, Black lives with 3.
Elementary level: Wrong Answer
If Black carelessly plays 1,
Black dies with White 2.
Black is short of liberties.
After Black 1 and 3,
Black 5 is crucial to get a Ko.
Intermediate level: Wrong Answer
Black 1 gets short of liberties,
and loses the capturing race.