Answers

(No. 264: May 14, 2001)

Elementary level: Answer

Black 1 is the vital point. If White 2,
Black wins the capturing race with 3 to 7.

Elementary level: Wrong Answer

Black 1 allows White to get a Ko with 2.

Intermediate level: Answer

Black 1 is the vital point.
If White 2, Black plays 3 to 11.
The result is a three-move-approach Ko for White.
(Black almost wins the capturing race.)
If White 2 at 3, Black wins with 2.

Intermediate level: Wrong Answer

Black 1 is wrong. With White 2 and 4, Black is dead.