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11.9 False Margins

The following situation is rare but special enough to warrant separate attention:

 
   OOOOXX
   OXaX..
   ------

Here `a' may be characterized by the fact that it is adjacent to O's eyespace, and it is also adjacent to an X group which cannot be attacked, but that an X move at 'a' results in a string with only one liberty. We call this a false margin.

For the purpose of the eye code, O's eyespace should be parsed as (X), not (X!).


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