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(No. 106: May 4, 1998)




Elementary level: Answer

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





Elementary level: Wrong Answer

Black 1 fails. White 2 is the vital point and gets a Ko.
(This is the same shape as the previous problem.)







Intermediate level: Answer

Black 1 is the vital point. After White 2, Black plays 3 to 7.
White cannot capture the Black stones because White is short of
liberties. White dies. If White 2 at 3, Black 2 kills White.





Intermediate level: Wrong Answer

Black 1 allows White to play at the vital point 2 and live.






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