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(No. 140: Dec. 28, 1998)



Elementary level: Answer

Black 1 is the vital point.
White cannot help but to create a Ko with 2 and 4.





Elementary level: Reference

If White 2, Black plays 3.
White dies because of shortage of liberties.





Elementary level: Wrong Answer

Black 1 and 3 also get a Ko. But this is an approach
move Ko and less advantageous for Black.






Intermediate level: Answer

Black 1 is the vital point. If White 2,
Black kills White with the moves to 7.
White cannot live because it is short of liberties.





Intermediate level: Variation

If White 2, Black kills White with 3 and 5.





Intermediate level: Wrong Answer

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





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