This strategy is very useful, if a bit risky..it calls for a massed assault in three different locations, with all but one being a decoy attack. I like to use Reavers on one side, Dragoons and Zealots in the middle, and Carriers supported by Scouts on the opposing side. What you do is build a massed Reaver force, build all of their scarabs, and load them into Shuttles (faster transport) and land them outside of, let's say, the enemy's left flank. Then poisition your Dragoons and Zealots in the middle, you'll want a LOT of these. Then move your Carriers, all with full Interceptors, with Scouts, to the right flank. Attack first on the left. Once that attack has been driven off, you may choose to attack again on the left side, in order to fake them into thinking that's your invasion route of choice. Once they fortify the left side, attack the middle. Again, you may want to attack more than once to fake them out. At this point, attack on the right side with all your fo! rces, relying heavily on the enemy's fortifying both the middle and the left instead of the right against attack. You should, theoretically, break through the line, and once the carriers are in, let them go wild destroying buildings. If the strategy doesn't work, its often because the enemy discovered your forces in reserve, so make sure you have the area well reconnoitered before attempting to stockpile anything there.

CreepColony's Opinion: This will require a lot of psi. And don't delay too much in between your attacks, or your opponent will build up.