Talking Dirty.... Wind

Then there's disturbed air by covering the entry of an opponents sail and using disturbed (by tip vortices) off the leech, directed into your opponents entry sail entry.

(One of our dirty tricks was a little extra pumping to muddy up the wind below us)

Then you could go on about wind bends this often causes as the coast bends in a bay, then there are temperature differentials and the gusty effect of cold downdrafts and the likely reaction the wind takes to lift on starboard after a rainstorm, the reason the wind moves round with the sun, the effect of low clouds bringing stronger wind, there's loads to talk about with wind effect on sailing.