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(No. 173: Aug. 16, 1999)



Elementary level: Answer

The combination of Black's moves
1 and 3 is crucial to win.

Elementary level: Answer



Elementary level: Wrong Answer 1

Black 1 fails to win.
After White 2, Black loses the race.

Elementary level: Wrong Answer 1



Elementary level: Wrong Answer 2

Black 3 fails. After White 4, Black loses the race.

Elementary level: Wrong Answer2



Intermediate level: Answer

The order of Black's moves 1 and 3
is crucial to live unconditionally.

Intermediate level: Answer



Intermediate level: Wrong Answer 1

Black 1 allows White to create a Ko with 2 and 4.
This is what happened in a game I played recently.

Intermediate level: Wrong Answer1



Intermediate level: Wrong Answer 2

Black 3 fails. White gets a Ko with the moves 4 to 10.

Intermediate level: Wrong Answer2



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