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(No. 127: Sep. 28, 1998)

Elementary level: Answer

Black 1 is the vital point. Black 3 is also crucial.
After White 4, Black gets a Ko with 5 and 7.

Elementary level: Variation

Black 1 is the vital point. After White 2, Black 3 is
crucial to get a Ko. If White 4, Black 5 gets a Ko.

Elementary level: Wrong Answer

Black 1 allows White to play at the vital point 2 and live.

Intermediate level: Answer

The combination of Black's moves 1 and 3 takes advantage
of White's shortage of liberties. White dies.

Intermediate level: Wrong Answer 1

If Black plays 1 first, White lives with 2 to 6.

Intermediate level: Wrong Answer 2

Black 3 is wrong. White lives with 4 and 6.

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