Protoss Vs. Zerg
Defending
*Make sure your Photon Cannons are grouped together because Zerglings can kill a single Photon Cannon easily.
*Keep an eye on all of your units. You don't want one of your men getting a Parasite and you now knowing it.
*If you are rushed with a bunch of Zerglings your best defense is Zealots.
*Defend against fleets of Mutalisks with Scouts. Scouts damage is greatly increased when it attacks air units.
Attacking
*Do not build a lot of Carriers because Scourges will take them out and losing a total of 500 resources is never a good thing.
*My favorite attack unit against Zerg are Reavers. They are deadly and almost impossible to stop. Send in a fleet of Reavers with Dragoons protecting them from air and have Observers spot the burrowed units.
*Use Archons for the initial attack and try to kill the air-attacking units then move in with Carriers.
