Answers

(No. 275: July 30, 2001)

Elementary level: Answer

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

Elementary level: Wrong Answer

Black 1 allows White the vital point 2.
Black loses the capturing race.

Intermediate level: Answer

Black 1 is the vital point.
If White 2, Black wins the capturing race with 3.
If White 2 at 4, Black wins with 3.

Intermediate level: Wrong Answer

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