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(No. 126: Sep. 21, 1998)



Elementary level: Answer

Black 1 is crucial. After White 2, Black 3 creates a Ko.
If White 2 at 3, Black 2 kills White.





Elementary level: Wrong Answer 1

Black 1 is wrong. White is alive with 2 and 4.





Elementary level: Wrong Answer 2

Black 1 also fails. White lives with 2 and 4.






Intermediate level: Answer 1

The combination of Black's moves 1 and 3 is crucial.
After Black 5, the next diagram.





Intermediate level: Answer 1

Black sacrifices its six stones with 9 and
lets White take them with 10.
Then Black 11, putting at 7, kills White.



9: connects at 6
11: puts at 7




Intermediate level: Wrong Answer

Black 1 first is wrong. White lives with 2 and 4.






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