(No. 225: Aug. 14, 2000)
Elementary level: Answer
The combination of Black 1 and 3 is crucial.
If White 2 to 4, Black lives by capturing
the White stones with the moves to 9.
Elementary level: Wrong Answer
Black 1 lets White connect at 2.
Black has nothing further to do.
Intermediate level: Answer
Black 1 to 3 is a Tesuji,
creating "Under the Stone."
After White 4, to the next diagram.
Intermediate level: Answer (Continued)
Black lives with 3,
capturing the three White stones.
Intermediate level: Wrong Answer
Black 1 is wrong.
White 2 to 4 kills Black.