(No. 181: Oct. 11, 1999)
Elementary level: Answer
Black 1 wedging in is the Tesuji
to rescue the four Black stones.
Elementary level: Variation
If White 2, Black connects with 3 and 5.
Elementary level: Wrong Answer
Black 1 lets White play 2 and
cut off Black's four stones.
Intermediate level: Answer
Black 1 is crucial. After White 2,
Black kills White with 3 to 7.
Intermediate level: Wrong Answer
Black 1 lets White live with 2 to 8.