(No. 160: May 17, 1999)
Elementary level: Answer
Black 1 is the vital point to win the race.
Elementary level: Wrong Answer 1
Black 1 is wrong. After White 2, Black loses the race.
Elementary level: Wrong Answer 2
Black 1 allows White to play at the vital point 2.
Black loses the race.
Intermediate level: Answer
Black 1 is the vital point and
3 is crucial to kill White.
If White 4, Black kills White with 5 and 7.
Intermediate level: Variation
If White plays 4 to 6, Black creates
a Five-point Nakate with 7 and 9.
Intermediate level: Wrong Answer
Black 3 is wrong. After White 4 to 8,
Black only gets a Ko with the moves to 13.
If Black 9 at 10, White plays at 9 and lives,
capturing the Black stones in an Oiotoshi.