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(No. 90: Jan. 12, 1998)




Elementary level: Answer

Black 1 is the vital point. After White 2,
Black 3 wins the race. If White 2 at 3,
Black 2 wins the race.





Elementary level: Wrong Answer 1

Black 1 allows White to play 2 and loses the race.





Elementary level: Wrong Answer 2

Black 1 also fails, allowing White to play on the vital point 2.







Intermediate level: Answer

The combination of Black's moves 1 to 9 gets a Ko.
Black 7 is crucial. If Black 7 at 9, White plays at 7 and lives.





Intermediate level: Reference Diagram

If White 2, Black lives with 3 to 7.





Intermediate level: Wrong Answer

Black 1 first is wrong. White lives with 2 to 8.






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