Answers

(No. 262: Apr. 30, 2001)

Elementary level: Answer

Black 1 is crucial.
After White 2, Black 3 gets a Ko.

Elementary level: Wrong Answer

Black 1 is wrong.
After White 2, there is nothing for Black to do.

Intermediate level: Answer

Black 1 is the vital point.
If White 2, Black lives with 3 to 7.
If White 2 at 5, Black lives with 7.

Intermediate level: Wrong Answer

Black 1 allows White to get a Ko with 2 to 6.
(The same shape as the preceding problem)