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(gnus)Advanced Scoring Tips

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Advanced Scoring Tips
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   The `&' and `|' logical operators do short-circuit logic.  That is,
they stop processing their arguments when it's clear what the result of
the operation will be.  For instance, if one of the arguments of an `&'
evaluates to `false', there's no point in evaluating the rest of the
arguments.  This means that you should put slow matches (`body',
`header') last and quick matches (`from', `subject') first.

   The indirection arguments (`1-' and so on) will make their arguments
work on previous generations of the thread.  If you say something like:

     ...
     (1-
      (1-
       ("from" "lars")))
     ...

   Then that means "score on the from header of the grandparent of the
current article".  An indirection is quite fast, but it's better to say:

     (1-
      (&
       ("from" "Lars")
       ("subject" "Gnus")))

   than it is to say:

     (&
      (1- ("from" "Lars"))
      (1- ("subject" "Gnus")))