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(No. 151: Mar. 15, 1999)



Elementary level: Answer

Black 1 is the vital point to win the capturing race.
After White 2, Black wins with 3 to 5.

Elementary level: Answer



Elementary level: Wrong Answer 1

Black 1 allows White to play at
the vital point 2 and to get a Ko.

Elementary level: Wrong Answer1



Elementary level: Wrong Answer 2

Black 1 also allows White to play at
the vital point 2 and to get a Ko.

Elementary level: Wrong Answer2



Intermediate level: Answer

The combination of Black's moves 1 and 3 is
crucial to save the two Black stones and kill White.
After Black 9, to the next diagram.

Intermediate level: Answer



Intermediate level: Answer(Continued)

After White 10, Black 11 is crusial to kill White unconditionally.
If Black 11 at 12, White gets a Ko with 11.

Intermediate level: Answer(Continued)



Intermediate level: Variation

Even though White tries to get a Ko with 10,
Black plays 11 to 15 and White is still dead.

Intermediate level: Variation



Intermediate level: Wrong Answer

Black 1 is wrong. After White 2 and 4,
Black cannot rescue the two stones.

Intermediate level: Wrong Answer



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