Answers

(No. 188: Nov. 29, 1999)

Elementary level: Answer

Black 1 is the vital point.
If White 2, Black lives with 3.

Elementary level: Wrong Answer

Black 1 allows White to hit on the vital point 2.
Black cannot help creating a Ko with 3.

Intermediate level: Answer

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

Intermediate level: Wrong Answer

Black 1 lets White live with 2.
(The same shape of the elementary level)