(No. 119: Aug. 3, 1998)
Elementary level: Answer
Black 1 is the vital point. White cannot get two eyes.
Elementary level: Wrong Answer
Black 1 lets White get a Ko with 2.
Intermediate level: Answer
Black 1 is the vital point. After White 2, Black 3 gets a Ko.
Intermediate level: Reference Diagram
If White 2, Black 3 kills White unconditionally.
Intermediate level: Wrong Answer 1
Black 1 allows White to play at the vital point 2.
White is alive. If Black 7 at 8, White lives with 7.
Intermediate level: Wrong Answer 2
Black 1 to 3 also fails. White lives with 4 to 10.
All Rights Reserved, Copyright (C) 1998, Hitachi, Ltd.