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endgame coupling
  Difficulty: Advanced   Keywords: EndGame

Here's an example.

[Diagram]
Diag.: coupling on the edge

Now White is in trouble:


[Diagram]
Diag.: two cutting points

Black will either be able to cut at a, or start a dangerous ko by cutting at b.


[Diagram]
Diag.: White's correct response

When Black played the marked stone, White must answer this way. The two white territories, on the left and right, are linked in a subtle relationship we can call 'coupling'.


[Diagram]
Diag.: White's correct response (continuation)

After that White can defend territory easily.

In this position the coupling effect is worth two extra points for Black.

Charles Matthews



This is a copy of the living page "endgame coupling" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.