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(No. 145: Feb. 1, 1999)



Elementary level: Answer

Black 1 is the vital point. If White 2,
Black connects with 3 and 5. White dies.

Elementary level: Answer



Elementary level: Variation 1

If White 2, Black 3 kills White.

Elementary level: Variation 1



Elementary level: Variation 2

If White 2, Black 3 kills White.
If White 2 at 3, Black 2 kills White.

Elementary level: Variation 2



Elementary level: Wrong Answer

Black 1 is wrong. White lives with 2 and 4.

Elementary level: Wrong Answer




Intermediate level: Answer

Black 1 is crucial. After White 2, Black kills White with 3 and 5.

Intermediate level: Answer



Intermediate level: Wrong Answer

Black 1 is wrong here. The result of Ko is not good enough.

Intermediate level: Wrong Answer



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