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(No. 94: Feb. 9, 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.
If White 4 at 5, Black kills White with 4.





Elementary level: Variation 2

If White 2, Black 3 kills White.





Elementary level: Wrong Answer

Black 1 allows White to get a Ko with 2.







Intermediate level: Answer

Black 1 is crucial.
After White 2, Black kills White with 3 to 9.





Intermediate level: Variation

If White 2, Black kills White by 3.
If White 2 at 3, Black plays at 2 and kills White.





Intermediate level: Wrong Answer 1

Black 1 lets White get a Ko with 2.





Intermediate level: Wrong Answer 2

Black 1 allows White to get a Ko with 2 and 4.






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