IntroExercise4/Answer

Sub-page of IntroExercise4

This shape is called the twisted four, and it's alive. White doesn't need to play anything here.

[Diagram]

Status?

If black plays B1 here, white plays W2 and has two eyes. The stone inside white's eye can't do anything: white can capture it at any time.

[Diagram]

Status?

The same thing happens if black starts on the other point. Many times a group will be alive because it has two equivalent ways to live. In Japanese they say the two moves are miai.

[Diagram]

W2 elsewhere

B1 here does not even require an immediate response: white is alive even if she plays elsewhere. The two middle points are still miai for life: If white plays a, then black plays b, and vice versa.


This is a copy of the living page "IntroExercise4/Answer" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About