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(No. 229: Sep. 11, 2000)



Elementary level: Answer

Black 1 is crucial.
If White 2, Black lives with 3 to 7.
If White 2 at 3, Back lives with 2.

Elementary level: Answer



Elementary level: Answer (Variation)

If White 2, Back lives with 3 to 5.

Elementary level: Answer (Variation)



Elementary level: Wrong Answer

Back 1 allows White the vital point 2.
Black dies.

Elementary level: Wrong Answer



Intermediate level: Answer

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

Elementary level: Answer



Intermediate level: Answer (Variation)

If White 2, Black 3 is crucial.
After White 4, Black 5 kills White.

Elementary level: Answer (Variation)



Intermediate level: Wrong Answer 1

Black 1 is wrong.
White lives with 2 to 12.

Intermediate level: Wrong Answer1



Intermediate level: Wrong Answer 2

Black 1 allows White to live with 2 to 10.

Intermediate level: Wrong Answer2




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