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(No. 188: Nov. 29, 1999)



Elementary level: Answer

Black 1 is the vital point.
If White 2, Black lives with 3.

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 allows White to hit on the vital point 2.
Black cannot help creating a Ko with 3.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is the vital point.
After White 2, Black gets a Ko with 3 and 5.

Intermediate level: Answer



Intermediate level: Wrong Answer

Black 1 lets White live with 2.
(The same shape of the elementary level)

Intermediate level: Wrong Answer




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