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(No. 100: Mar. 23, 1998)




Elementary level: Answer

Black 1 is the vital point.
After White 2, Black 3 creates a five-point Nakate.
White dies.





Elementary level: Reference diagram

If White 2, Black 3 kills White.





Elementary level: Wrong Answer

Black 1 allows White to play at the vital point 2
and get a Seki with the moves to White 8.







Intermediate level: Answer

Black 1 is the vital point.
After White 2 and 4, Black 5 is also
crucial to capture the White stones.





Intermediate level: Wrong Answer 1

Black 1 fails. It allows White to play at the vital
point 2 and live with 4. Black is dead.





Intermediate level: Wrong Answer 2

Black 5 lets White get a Ko with 6 and 8.






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