(No. 137: Dec. 7, 1998)
Elementary level: Answer
Black 1 is the vital point. After White 2, Black 3 is a Tesuji
to destroy White's eye shape. White is dead when Black plays 9.
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Elementary level: Wrong Answer
Black 1 is wrong. White lives with 2 and 4.
Intermediate level: Answer
The combination of Black's moves 1 and 3 is crucial.
White has no other way but to get a Ko with the moves to 6.
Intermediate level: Reference
If White 4, Black kills White with 5 and 7.
Intermediate level: Wrong Answer 1
Black 1 allows White to live with 2.
Intermediate level: Wrong Answer 2
Black 3 first lets White get a Seki with 4 and 6.
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