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Gnus Manual

7.15.3 Advanced Scoring Tips

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")))