(No. 252: Feb. 19, 2001)
Black 1 is crucial. After White 2, Black gets a Ko with 3.

Elementary level: Wrong Answer
Black 1 is wrong. White plays 2 to 6 to kill Black.

Black 1 is crucial. Black gets a Ko with the moves to 5.

Intermediate level: Wrong Answer
Black 1 fails.
The result is a double-Ko with the moves to White 6.
Black dies.
