Rampant Games - 17 Combat Encounters
Jay Barnson lists 17 different types of combat encounters in the hope of seeing more variation in CRPGs:
14) Non-Lethal Attacks - The enemy launches a quick raid set the party back (and gain treasure) rather than to kill them. It may be a quick robbery to deprive the party of equipment (or the functional equivalent via a Disenchanter or Rust Monster), or an attempt to lure / force the party into a trap, or simply to get them to waste spells, potions, and charges on magical items for an all-out battle that doesn't happen until later. Another example is an entirely illusionary encounter, which again may cost the party resources.