Answers

(No. 158: May 3, 1999)

Elementary level: Answer

Black 1 is crucial to kill White.

Elementary level: Wrong Answer

Black 1 allows White to play 2 and 4
to capture the Black stones in an Oiotoshi.
White lives.

Intermediate level: Answer

Black 1 is crucial to kill White.
After White 2, Black 3 kills White.

Intermediate level: Variation

If White 2, Black 3 creates
a Five-point Nakate to kill White.

Intermediate level: Wrong Answer

Black 1 is wrong. After White 2 and 4,
Black gets no more than a Ko with 5.