(No. 214: May 29, 2000)
Elementary level: Answer
Black 1 is crucial.
(similar to the preceding problem)
After White 2, Black lives with 3.
Elementary level: Wrong Answer
Black 1 is wrong. After White 2 and 4, Black is dead.
Intermediate level: Answer
Black 1 is the vital point.
If White 2 to 4,
Black 5 creates a five-point Nakate.
White is dead.
Intermediate level: Wrong Answer 1
Black 1 is wrong.
After White 2, this is a shape of ten-thousand-year Ko.
(This is almost a Seki.)
Intermediate level: Wrong Answer 2
Black 1 allows White to live with 2.