Answers

(No. 191: Dec. 20, 1999)

Elementary level: Answer

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

Elementary level: Wrong Answer

Black 1 is wrong. With White 2, Black loses the capturing race.

Intermediate level: Answer

Black 1 and 3 are crucial to get a Ko.
If White 4, Black plays 5. It is still a Ko.

Intermediate level: Variation

If White 2, Black plays 3. After White 4, Black 5 gets a Ko.
If White 4 at 5, Black cuts at 4. White dies.

Intermediate level: Wrong Answer

Black 1 is wrong. White gets a Seki with 2 to 6.