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(No. 242: Dec. 11, 2000)



Elementary level: Answer

Black 1 is the vital point.
After White 2, Black 3 kills White.

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 allows White the vital point 2.
White lives.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is crucial.
If White 2, Black 3 to 7 kills White.

Intermediate level: Answer



Intermediate level: Answer (Variation)

If White 2, Black 3 kills White.

Intermediate level: Answer(Variation)



Intermediate level: Wrong Answer

Black 1 allows White to get a Ko with 2 to 6.
(The same shape as the preceding problem)

Intermediate level: Wrong Answer




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