Answers

(No. 263: May 7, 2001)

Elementary level: Answer

After Black 1 and White 2, Black 3 is crucial.
If White 4, Black 5 gets a Ko.

Elementary level: Wrong Answer

Black 3 fails. After White 4, Black cannot do anything more.

Intermediate level: Answer

Black 1 is crucial.
After White 2, Black 3 is also crucial.
If White 4, Black lives with 5 to 9.
If White 2 at 3, Black lives with 2.

Intermediate level: Wrong Answer

Black 1 is wrong. After White 2,
there is no way that Black can live.