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(No. 157: Apr. 26, 1999)



Elementary level: Answer

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

Elementary level: Answer



Elementary level: Variation

If White 2, Black lives with 3 to 5.

Elementary level: Variation



Elementary level: Wrong Answer

Black 1 is wrong. After White 2,
Black cannot live because it is short of liberties.
(The same shape as the previous problem.)

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is the vital point.
After White 2, Black kills White with 3 to 7.

Intermediate level: Answer



Intermediate level: Variation

If White 2, Black kills White with 3 to 5.

Intermediate level: Variation



Intermediate level: Wrong Answer

Black 1 fails. White lives with 2 to 6.

Intermediate level: Wrong Answer



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