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(No. 169: July 19, 1999)



Elementary level: Answer

Black 1 is the vital point to cut and capture the White stones.

Elementary level: Answer



Elementary level: Wrong Answer

Black 1 is wrong.
After Black 3, White plays 4 to 6.
Black cannot live.

Elementary level: Wrong Answer



Intermediate level: Answer

Black 1 is the vital point.
If White 2, Black lives with 3.
If White 2 at 3, Black lives with 2.

Intermediate level: Answer



Intermediate level: Wrong Answer

Black 1 allows White to play at the vital point 2.
After Black 3 and White 4, Black cannot do anything further.
White can get a Ko at A whenever he likes.

Intermediate level: Wrong Answer



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