(No. 360: Mar. 17, 2003)
Black 1 is the vital point.
If White 2, Black creates a Ko with 3.
Elementary level: Reference Diagram
If White 2, Black 3 lets White take at 4.
Then to the next diagram.
Elementary level: Reference Diagram (Continued)
Black takes the five White stones with 5 and 7 and lives.
Elementary level: Wrong Answer
Black 1 allows White the vital point 2 and dies.
Black plays 1 to 7 first,
then Black 9 is the vital point to win the race.
Intermediate level: Wrong Answer 1
Black 5 allows White the vital point 6 and loses the race.
Intermediate level: Wrong Answer 2
To play Black 5 and 7 first fails.
White gets a Ko with 8 to 12.