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(No. 142: Jan. 11, 1999)



Elementary level: Answer

Black sacrifices a stone with 1.
After White 2, Black 3 gets a Ko.





Elementary level: Wrong Answer

Black 1 lets White connect at 2, and nothing happens.






Intermediate level: Answer

The combination of Black's moves
1 and 3 is crucial to kill White.





Intermediate level: Wrong Answer

Black 1 allows White to live with the moves 2 to 6.





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