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(No. 236: Oct. 30, 2000)



Elementary level: Answer

Black 1 is crucial to live.
If White 2, Black lives with 3.
If White 2 at 3, Black lives with 2.

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 is wrong. After White 2,
Black has to create a Ko with 3.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is crucial.
After White 2, Black lives with 3 to 7.

Intermediate level: Answer



Intermediate level: Wrong Answer

Black 1 fails to live unconditionally.
Black has to create a Ko with the moves to 5.

Intermediate level: Wrong Answer




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