Answers

(No. 245: Jan. 1, 2001)

Elementary level: Answer

Black 1 is the vital point.
If White 2, Black 3 is crucial.
After White 4, Black connects at 5
and lets White take at 6.
Then to the next diagram.

Elementary level: Answer (Continued)

Black 7 kills White.
If White 8 at 9, Black 8 kills White.

Elementary level: Wrong Answer

Black 1 lets White live with 2.

Intermediate level: Answer 1

Black 1 and 3 are crucial.
After White 4, Black 5 is a brilliant move
and here Chosei(Longevity) starts.
After White has taken at 6, to the next diagram.

Intermediate level: Answer 2

Black retakes at 7. Then to the next diagram.

Intermediate level: Answer 3

If White 8, Black takes Ko at 9.
After this, even if White retakes Ko,
it becomes the same shape as the first diagram and
Black has infinite numbers of Ko threats
with 5 and 7(Chosei). Black is alive.

Intermediate level: Wrong Answer

Black 1 allows White to get a Ko with 2.