(No. 116: July 13, 1998)
Elementary level: Answer
Black 1 is the vital point of this shape. After White 2,
Black 3 is crucial. After White 4, Black 5 destroys White's eye shape.
If White 2 at 4, Black still plays at 3 to kill White.
Elementary level: Variation
If White 2, Black 3 kills White.
Elementary level: Wrong Answer
Black 1 lets White live with White 2.
Intermediate level: Answer
Black 1 is the vital point. After White 2, Black 3 gets a Ko.
If White 4 at 5, Black plays 4. It is also a Ko.
Intermediate level: Variation
If White 2, Black also gets a Ko with 3 and 5.
Intermediate level: Wrong Answer
Black 1 allows White to play at the vital point 2.
The White stones cannot be captured.
Black dies unconditionally.
All Rights Reserved, Copyright (C) 1998, Hitachi, Ltd.