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(No. 227: Aug. 28, 2000)



Elementary level: Answer

Black 1, sacrificing a stone,
makes White short of liberties.
After Black 3, White is dead.

Elementary level:Answer



Elementary level: Wrong Answer

Black 1 first allows White
to live with 2 to 4.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is crucial.
After White 2, Black 3 to 5 gets a Ko.
If White 2 at 3, then Black 2, White 4, Black 5.
This also a Ko.
If White 2 at 5, Black lives with 4,
White 2, Black 3 in a Seki.

Elementary level: Answer




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