If you and your partner are both Protoss. the first player starts by mining minerals and get to the reaver stage as soon a possible, make sure to upgrade everything for the reaver and get two Arbiter with recall upgrade. you will also need two high templar for hallucination to get past the defense.Get four reavers and a group a dragoons and a couple of dark templar if you have enough minerals and gas. Find the enemy's weak spot then hallucinate your arbiter and bring your real and hallucinated arbiters in to the mining place of your enemy and start recalling reavers and dragoons. if you have an ally. he should bring air to create a hoax so you can warp sucessfully.

CreepColony's Opinion: Almost all the time, 1 recall will only get rid of their miners this way, so be prepared for later.