(No. 133: Nov. 9, 1998)
Elementary level: Answer
Black 1 is crucial to live. If White 2, Black lives with 3.
Elementary level: Wrong Answer 1
Black 1 is wrong. After White 2, Black cannot
make two eyes, because it is short of liberties.
Elementary level: Wrong Answer 2
Black 1 also fails. White kills Black with 2 and 4.
Intermediate level: Answer
Black 1 is crucial to live. If White 2 and 4,
Black gets a Seki with the moves to 7.
Intermediate level: Variation
If White 2, Black lives with the moves to 7,
capturing the White stones in an Oshitsubushi.
Intermediate level: Wrong Answer
Black 1 is wrong. White plays 2 to 6, and Black dies.
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