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(No. 165: June 21, 1999)



Elementary level: Answer

Black 1, sacrificing a stone, is crucial.
After White 2, Black wins the capturing race with 3 to 5.

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 is wrong and loses the race with White 2.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is the vital point. After White 2,
Black kills White with the moves 3 to 7,
just like the preceding problem.

Intermediate level: Answer



Intermediate level: Variation

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

Intermediate level: Variation



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