Answers

(No. 246: Jan. 8, 2001)

Elementary level: Answer

Black 1 is the vital point.
If White cuts at 2, Black is safe with 3.

Elementary level: Wrong Answer 1

Black 1 allows White the vital point 2.
Black cannot but create a Ko with 3.

Elementary level: Wrong Answer 2

Black 1 also allows White the vital point 2.
Black has to create a Ko with 3.

Intermediate level: Answer

Black 1 is the vital point.
If White 2, the combination of
Black's moves 3 and 5 is crucial.
After Black 9, White cannot live because
it is short of liberties.
If White 2 at 4, Black 5 kills White.

Intermediate level: Wrong Answer

Black 1 lets White live with 2 to 10.