This is a very easy way to kill a computer. Early in the game build a pylon and a forge. Then send a probe out to find the computer's base and build a pylon there. Once it is finished build several cannons around the pylon. Be sure to put these as close to the main enemy building as possible for a clean kill.
Protoss - Corsairs & Dark Templar
One strategy that ive found works very well is the combintaion of corsairs and dark templar. This is an obviously powerful strategy scince corsairs, in force, are a very powerful specialized air unit and likewise dark templar can be devastating because of the constant cloaking ability and very strong attack. This works best in a no rush game when you have time to upgrade fully. The key for this strategy is to take out dectectors first. Once dectectors are gone you are free to attack any units that can fire into the air. After theses are disposed of your units are free to go wherever they please without being attacked. This is why the strategy is so powerful.
