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(No. 138: Dec. 14, 1998)



Elementary level: Answer

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





Elementary level: Variation

If White 2, Black 3 gets a Ko.





Elementary level: Wrong Answer

Black 1 is wrong. After White 2,
Black cannot do anything further.






Intermediate level: Answer

Black 1 is crucial. If White plays 2 and 4,
Black lives with the moves to 5.





Intermediate level: Variation

If White 2, Black lives with 3.





Intermediate level: Wrong Answer

Black 1 is wrong. White plays 2 to 6 to get a Ko.
(This is the same shape as the previous problem.)






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