Answers

(No. 255: Mar. 12, 2001)

Elementary level: Answer

Black 1 is the vital point.
White 2 is crucial to create a Ko
after Black 3 with White 4.

Elementary level: Wrong Answer

Black 1 allows White the vital point 2.
Black cannot capture the White stones,
and Black dies.

Intermediate level: Answer

Black 1 is crucial.
After White 2, Black 3 lets White take
the two Black stones at 4 and retakes at 5.
White dies.

:

retakes under

Intermediate level: Wrong Answer

Black 1 allows White to get a Ko with 2 to 6.