Answers

(No. 270: June 25, 2001)

Elementary level: Answer

Black 1 is the vital point.
After White 2, Black gets a Ko with 3 and 5.

Intermediate level: Answer

Black 1 is the vital point to win the capturing race.

Intermediate level: Wrong Answer 1

Black 1 allows White the vital point 2.
After White 4 and Black 5, this results in a Ko.

Intermediate level: Wrong Answer 2

Black 1 also allows White the vital point 2 to get a Ko.