(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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