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(No. 161: May 24, 1999)



Elementary level: Answer

Black 1, sacrificing one more stone is the vital point.
After White 2, to the next diagram.

Elementary level: Answer



Elementary level: Answer (Continued)

Black 3, sacrificing one more stone is crucial.
After White 4, Black gets a Ko with 5 and 7.

Elementary level: Answer(Continued)



Elementary level: Wrong Answer

Black 1 is wrong. After White 2,
Black is captured unconditionally.

Elementary level: Wrong Answer



Intermediate level: Answer

The combination of Black's moves 1, 3 and 5 kills White.
This is the same shape as the preceding problem (No.160),
and White dies unconditionally.

Intermediate level: Answer



Intermediate level: Variation

If White 2 and 4, Black 5 is crucial to kill White.
(The same shape as the problem No.159.)

Intermediate level: Variation



Intermediate level: Wrong Answer

Black 1 fails. After White 2 and Black 3, White 4 is
the vital point to get a Ko with the moves to 10.

Intermediate level: Wrong Answer



Intermediate level: Wrong Answer(Variation)

If Black 5, White 6 gets a Ko.

Intermediate level: Wrong Answer(Variation)



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