(No. 202: Mar. 6, 2000)
Elementary level: Answer
Black 1 is the vital point of this capturing race.
Black wins with the moves to 5.
Elementary level: Wrong Answer
Black 1 allows White to play at
the vital point 2 and loses the race.
Intermediate level: Answer
The combination of Black 1 and 3 is crucial,
and gets a Ko with the moves to 5.
Intermediate level: Variation
If White 2, Black 3 gets a Ko.
Intermediate level: Wrong Answer
Black 1 allows White to play on the vital point 2
and loses the capturing race.