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(No. 199: Feb. 14, 2000)



Elementary level: Answer

Black 1 is the vital point. After White 2,
Black gets a Ko with 3 to 5.
If White 2 at 4, Black 2 kills White.

Elementary level:Answer



Elementary level: Wrong Answer

Black 1 lets White live with 2.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is crucial. White has no choice
but to create a Ko with 2 to 4.

Intermediate level: Answer



Intermediate level: Wrong Answer

Black 1 to 3 is wrong.
With White 4, Black loses the race.

Intermediate level: Wrong Answer




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