(No. 171: Aug. 2, 1999)
Elementary level: Answer
Black sacrifices a stone with 1, and lives with 3.
Elementary level: Wrong Answer
Black 1 fails to live with White 2.
Intermediate level: Answer
Black wins by sacrificing two stones with 1 and 3.
Intermediate level: Wrong Answer 1
Black 3 fails to win.
White can turn this into a Ko with 2 to 8.
Intermediate level: Wrong Answer 2
Black 1 lets White connect at 2.
Black loses the capturing race.