Answers

(No. 254: Mar. 5, 2001)

Elementary level: Answer

Black 1 is crucial to connect with the right side.
This looks easy, but I once saw
an amateur Dan-player miss this move.

Elementary level: Wrong Answer

Black 1 is wrong. After White 2,
Black cannot connect with the outside.

Intermediate level: Answer

Black 1 is crucial.
If White 2, Black lives with 3 and 5.
After White 6, Black lives with 7.
If White 6 at 3, Black lives with 7.

Intermediate level: Wrong Answer

Black 1 allows White to get a Ko with 2 and so on.