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(No. 137: Dec. 7, 1998)

Elementary level: Answer

Black 1 is the vital point. After White 2, Black 3 is a Tesuji
to destroy White's eye shape. White is dead when Black plays 9.

8: connects at 3

Elementary level: Wrong Answer

Black 1 is wrong. White lives with 2 and 4.

Intermediate level: Answer

The combination of Black's moves 1 and 3 is crucial.
White has no other way but to get a Ko with the moves to 6.

Intermediate level: Reference

If White 4, Black kills White with 5 and 7.

Intermediate level: Wrong Answer 1

Black 1 allows White to live with 2.

Intermediate level: Wrong Answer 2

Black 3 first lets White get a Seki with 4 and 6.

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