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(No. 150: Mar. 8, 1999)



Elementary level: Answer

Black 1 is cracial to kill White. White cannot help but play 2,
because it is short of liberties. Then Black 3 kills White.

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 allows White to live with 2.

Elementary level: Wrong Answer1



Intermediate level: Answer

Black 1 is crucial. If White 2, Black 3 gets a Ko.

Intermediate level: Answer



Intermediate level: Variation

If White 2, Black plays 3.
After White 4, Black gets a Ko with 5 to 9.
If White 4 at 6, Black 4 gets a Ko.

Intermediate level: Variation



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