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FD Terran = Factory Double Terran?
I've seen this misunderstanding quite few times in TL.
I hope I can clarify it.
FD Terran is 1 Factory double build, but it does not stand for (F)actory (D)ouble Terran.
FD Terran stands for (F)ake (D)ouble Terran, created by Cha Jaewook of Sparkyz.
Gundam V, an old boy progamer dating back to the earliest days of boxer and prime time of h.o.t. forever, is the father of the Terran strategy dubbed Gundam Rush. Gundam V, unlike anyother Terran of that age, was famous for not blockading front entrace against Protoss. No other Terran even dared to mimic Gundam V's style because not only was it so risky against Protoss, but building a barrack and supply(ies) in the entrace hindering Protoss was simply more effective. Leaving the front entrace wide open almost always enticed opponent Protoss' Dragoons near Terran entrance, and Gundam would defend with 4 Marines and a soon added Tank (Back in those days, not seeing a single Marine in vs Protoss was not unusual). But, Gundam does not stop there but pushes the Dragoon back with 4 Marines and a Tank with extensive micro, and furthermore a Vulture, with a suicide mission goes around the map undetected, lays mines in Dragoon's retreating path eradicating the shield-worn(from fighting Marines and a Tank) Dragoons. Then, it's just pumping Vulture and Tanks from each of the two Factories to end the game, as soon as the Siege Mode research is done. Gundam V was hailed to be undefeatable by Protoss. His vs Protoss percentile was well above 85% in his prime time, until his weak vs Z crashed him hard and made him retire. All in all, secret of this Gundam V's execution of magnificient build was in a controlled production of SCV's, which at that time was unheard of. All progamers tried to pump out their worker units asap in those prehistoric days.
Since then, Gundam Rush was casted aside not adhering to the trend of progaming scene with the appearance of NaDa, and those alike utilizing macromanagement to its fullest extent. It was used sparingly just like Zerg's 4~5 drone build, or Protoss' proxy gate.
And, out of nowhere there comes the FD Terran build roughly 5 years after Gundam Rush had once dominated the progaming scene.
A mutation of once notorious Gundam Rush, similarly, FD Terran pushes the Dragoons stationed near Terran base entrance with 4 Marines + 1 Tank, but this time beguiling the opponent Protoss that imminent Vultures are on their way with their mines backstabbing the retreating Dragoons. This action makes Protoss to pull their Dragoons to their base in fear of losing Dragoons, and buys the luxury for Terran to an early expansion. Cha Jaewook was credited for reviving and upgrading this ancient build and demonstrating with some degree of completion. Soon after, FD Terran brought a new paradigm(as all of you know well) in TvsP, a stale match for sometime.
In the early development of FD Terran, it was acclaimed to be the ultimate build for Terran vs Protoss assuring Terran a much safer expansion compared to 1 Factory no Marine double build, and a much economically abundant build than a 2 Factory double build(or anyother). Then, as the Protoss became more scrutinizing and confident in their micro controls(first against Marines, and then relatively recently against spider mines), Terrans added more Marines to increase their damage to effectively thwart off Dragoons and buy more time (Dragoon's dreaded 4 volleyball laser balls kill one single puny Marine). Now, it is not unusual to see Marines numbering up to 7 or 8, when Terran marches for the first push.
Protoss sure had their times of much peril when this build was introduced, and was on the process of being perfected(increase in number of Marines, more meticulously controlled scv production). But, as 2 Gateway late Robotics/Observer build, pumping out more Dragoons(+1 Zealot from time to time), became more refined, Protoss finally evolved to a point where once they detect the FD Terran, they can not only withstand FD Terran's early push but counter and deny the early expansion if not end the game altogether(most recent example is NaDa vs Anytime's recent final). Since then, there came the days when Terrans cried out aloud in agony stating "FD Terran is a deceased bulid", but nonetheless FD Terran evolved furthermore intermixing with 1(2) Factory double build, and now became one of the strategical decisions Terran players had to choose in early game; rather than a sure-win(earlier days)/sure-lose(post earlier days) strategy against Protoss.
(F)ake (D)ouble Terran, known for its beguilement during its dominating period, was soon ridiculed out of frustration by whining Protoss progamers as (F)ace (D)ouble Terran, implying that whenever that group of Marines and a Tank come out, Terran is, basically, declaring in public that he will expand; and eventually OWN the Protoss.
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The beauty of FD Terran relies on excruciating micro control Terran, and when executed perfectly by a S level Terran, against a S level Protoss, the match has just become one degree more intense. I once saw Tossgirl perform an outdated version of FD Terran(can't remember which), and boy...... isn't she so, so bad. It just made me realize more clearly that FD's perfect execution(and its countering defense) is only done by the best progamers. That is the essence of FD Terran build.
Any additions, to this those I may not be aware of are much appreciated and welcome.