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(No. 91: Jan. 19, 1998)




Elementary level: Answer

Black 1 is the vital point. After White 2,
Black 3 is crucial to kill White.





Elementary level: Variation

If White 2, Black kills White with 3 and 5.





Elementary level: Wrong Answer 1

Black 3 allows White to get a Ko with 4.





Elementary level: Wrong Answer 2

Black 1 is wrong. White is alive with 2.







Intermediate level: Answer

Black 1 is crucial to kill White.
If White 2 at 4, Black 3 kills White.
If White 2 at 3, Black 2 kills White.
If White 2 at 5, Black 3 kills White.





Intermediate level: Wrong Answer

Black 1 allows White to get a Ko with 2 and so on.






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