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(No. 139: Dec. 21, 1998)



Elementary level: Answer

The combination of Black's moves 1 and 3 is crucial.
White cannot get two eyes because it is short of liberties.
If White 4 at 5, Black 4 kills White.





Elementary level: Wrong Answer 1

Black 1 allows White to live with 2.





Elementary level: Wrong Answer 2

Black 3 is wrong. White lives with 4.






Intermediate level: Answer

Black 1 is crucial. After White 2, Black plays 3 and 5.
White dies. If White 2 at 3, Black 2 kills White.





Intermediate level: Wrong Answer

Black 1 is wrong. White lives with 2 to 6,
capturing the Black stones in an Oiotoshi.






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