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(No. 149: Mar. 1, 1999)



Elementary level: Answer

Black 1 is crucial to live. If White 2,
Black plays 3 to capture the two White stones.

Elementary level: Answer



Elementary level: Variation

If White 2, Black plays 3 and 5 to capture
the White stones in an Oiotoshi.

Elementary level: Variation



Elementary level: Wrong Answer 1

Black 1 is wrong. After White 2, Black is dead.

Elementary level: Wrong Answer1



Elementary level: Wrong Answer 2

Black 1 also fails. After White 2,
Black gets no more than a Ko with 3 and 5.

Elementary level: Wrong Answer2



Intermediate level: Answer

The combination of Black's moves 1 and 3 is crucial
to kill White. After Black 9, White is dead.

Intermediate level: Answer



Intermediate level: Wrong Answer 1

Black 1 allows White to live with 2.
(The same shape as the elementary problem No.148.)

Intermediate level: Wrong Answer1



Intermediate level: Wrong Answer 2

Black 1 allows White to live with 2.

Intermediate level: Wrong Answer2



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