(No. 134: Nov. 16, 1998)
Elementary level: Answer
Black 1 is the vital point to get two eyes.
Elementary level: Wrong Answer 1
Black 1 fails. White plays on the vital point 2,
and there is no way for Black to make two eyes.
Elementary level: Wrong Answer 2
Black 1 allows White to play at the vital point 2
and kill Black with the moves to 6.
Intermediate level: Answer
Black 1 is crucial. After White 2, Black gets a Ko with 3.
Intermediate level: Reference
If White 2 and 4, Black lives with 3 to 5.
Intermediate level: Wrong Answer
Black 1 is wrong. White plays 2 to 6, and Black dies.
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