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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!)
.