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(No. 92: Jan. 26, 1998)




Elementary level: Answer

Black 1 is the vital point.
If White 2, Black 3 kills White.





Elementary level: Variation 1

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





Elementary level: Variation 2

If White 2, Black 3 kills White.





Elementary level: Wrong Answer

Black 1 allows White to live with 2 and 4.







Intermediate level: Answer

Black 1 is crucial. After White 2, Black 3 gets a Ko.





Intermediate level: Reference Diagram

If White 2, Black lives with 3.





Intermediate level: Wrong Answer

Black 1 is wrong. After White 2, Black cannot live.
(The same shape as No.84)






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