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(No. 116: July 13, 1998)




Elementary level: Answer

Black 1 is the vital point of this shape. After White 2,
Black 3 is crucial. After White 4, Black 5 destroys White's eye shape.
If White 2 at 4, Black still plays at 3 to kill White.





Elementary level: Variation

If White 2, Black 3 kills White.





Elementary level: Wrong Answer

Black 1 lets White live with White 2.






Intermediate level: Answer

Black 1 is the vital point. After White 2, Black 3 gets a Ko.
If White 4 at 5, Black plays 4. It is also a Ko.





Intermediate level: Variation

If White 2, Black also gets a Ko with 3 and 5.





Intermediate level: Wrong Answer

Black 1 allows White to play at the vital point 2.
The White stones cannot be captured.
Black dies unconditionally.






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