(No. 203: Mar. 13, 2000)
Elementary level: Answer
Black 1 to 3 is the Tesuji to capture
the White stones in an Oiotoshi.
Elementary level: Wrong Answer
Black 1 allows White to escape with 2 to 10.
Intermediate level: Answer
The combination of Black 1 and 3 is crucial to escape.
Intermediate level: Wrong Answer
Black 1 is wrong. After White 2,
there is no way for Black to escape.