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(No. 196: Jan. 24, 2000)



Elementary level: Answer

Black 1 is the vital point.
After White 2, Black 3 creates a Ko.
(The same shape as the preceding problem.)

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 allows White to play on the vital point 2 and live.
White lives in a Seki. If Black 3 at 4, White lives with 3.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is the vital point. If White 2,
Black 3 is crucial to win the capturing race.
(The same shape as the preceding problem.)

Intermediate level: Answer



Intermediate level: Variation

If White 2, Black wins with 3 to 9.

Intermediate level: Variation



Intermediate level: Wrong Answer

Black 1 is wrong. After White 2, Black gets
no more than a Ko with the moves to 9.

Intermediate level: Wrong Answer




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