"-Build 7 SCVs, make 7th build a supply depot.

-Build more SCVs, get 4 Barracks, get a Refinery.

-After 4 Barracks are done, start pumping out Marines, and get out an Academy.

-Build an Engineering Bay or two, and research U-238 shells and Stimpack.

Note: Depending on the game, you might want to build defense first.

-Build a Factory, and then 2 Starports with Control Towers.

-While doing all this, upgrade Infantry Weapons and keep pumping out tons of marines.

-Research Wraith cloaking and energy, and get out some dropships.

-Do that until you can get at LEAST 7 or 8 dropships.

-Build about 12 Wraiths.

-Put a bunch of back-up Marines in your base.

-Look for a place in your opponent's base that is not heavily guarded, and bust in.

-Cloak your Wraiths and attack all their defense.

-While Wraiths are busy, drop your marines in an unguarded area, like in the middle of their workers or a bunch of buildings.

Note: If you want, you can put 6 marines and 2 Medics in each Dropship, rather than just 8 marines.  I don't find Medics that helpful late in the game, but hey, every game is different.

-This should kill your opponent.

-If it doesn't, he/she will probably attack, and since you got back-up Marines, it shouldn't be a problem.

-Then attack him/her again." - Creep Colony

 

GU's Opinion: Effective... I tried it... It works... But it would be better with more of an air defense. The problem with most of these strategies is they they require two people to get them off as fast as possible.  

 

 

Zerg:

"this is probably the most undefeatable strategy there is so get ready! Send drones to get minerals and get as many drones as you can. make three overlords and then another hatchery. when the second hatchery comes in get many more workers for good mineral uptake. take up all the vespene geysers you can and then get a spawning pool and evolutionary chamber. stock up on defense because this will take a while. when spawning pool is in get another hatchery and morph into lair. get about 6 more overlords and drones, then get a spire and queens nest. as soon as possible morph into a hive and evolve spire into a greater spire and then get an ultralisk den. get 1 or two more hatchery and start stock piling with devourers and ultralisks. as you need get more overlords and workers. when you reach the psi limit send out your ultralisks followed by some overlords for detectors and devourers for air backup. this is probably the most powerful strategy I know, and wins the game at least 90% of the time." - Creep Colony

GU's Opinion: A bunch of Lurkers or a nuke could take them out fast. This "Unbeatable" Strategy is very beatable. You have to build defense and then your attackers. If you can attack first then you can fail this strategy.

Protoss: