..
Crafty will not "calculate" that 3.B-b5 is a strong move because it involves
the "threat" to exchange a Bishop for a mere Knight (losing the "minor
exchange" -- Fischer).

Please do not attempt to bash computers for *recognising* this slight
superiority, as Fischer did the same thing, just as his teacher has explained
it to him.

Mobility has been a key issue with chess programs for many years, and there
is no denying that a Bishop's average mobility is *superior* to that of a
Knight, except when stupid humans have locked-up the pawns, due to their utter
incompetence at what is really, nothing more than a complex math excercise.

-- The Ghost of DeeperBlue