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(No. 121: Aug. 17, 1998)



Elementary level: Answer

The order of Black's moves 1 and 3 is
crucial to win the race. White dies.





Elementary level: Variation

If White 4, Black plays 5. If White 6, Black plays 7. White cannot capture Black because
White is short of liberties. White is dead.





Elementary level: Wrong Answer

Black 1 first allows White to live with 2 to 6.






Intermediate level: Answer

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





Intermediate level: Wrong Answer 1

Black 1 lets White get a Ko with White 4 and 6. If Black 5 at 6, White 5 gets a Ko, also.





Intermediate level: Wrong Answer 2

Black 1 allows White to live with 2 to 6.






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