The 4-1-2-1-2, also known as the 4-4-2 (diamond), is becoming an increasingly viable formation in modern football.
Here, Bleacher Report breaks down its core mechanics, explains why it works and provides examples of successful and unsuccessful uses.
Take a 4-4-2, split the central midfielders vertically and push the wingers inside. Easy.
The 4-1-2-1-2 thrives off of mobility, vertical movement and physical prowess. Without wingers, it's the full-backs' job to bomb forward with regularity and stretch the pitch. When this happens, the deepest of the four midfielders will typical drop in to cover the defence.
The midfield four creates a numerical advantage against almost every other formation, but sacrificing width makes the full-backs' job very, very important.
If the full-backs can't get forward and create an outlet on the touchline, this formation will collapse in on itself. Similarly, if the midfielders aren't comfortable in possession and lose the ball, your right-back can get caught way up the pitch while counterattacking sides have a field day.
Sir Alex Ferguson opted for a 4-4-2 diamond formation in their 3-0 win over Newcastle United this season. He's used it sporadically so far, with the Braga game being another example.
The wily old Scot never makes the same mistake twice, and last season's 3-0 loss at St. James' Park saw United dominated on and off the ball. The switch to a possession-based diamond worked; this time, United were the 3-0 victors, and they dominated away from home for a change.
The 4-1-2-1-2 system helped them maintain control, and Rafael's adventurous runs forward allowed them to maintain a wide pitch.
Mircea Lucescu's side tried a midfield diamond in the 2007-08 season, but it wasn't as effective as he would have hoped.
Darijo Srna and Razvan Rat were overpowered when the Hirnyky came up against top-class opposition. Without a presence in the wide areas, the 4-1-2-1-2 fell in the way you'd imagine it does on paper.
The flaws are clear, the risks are there to see. Master it, and you've got yourself an excellent system; get it wrong, and it's a nightmare.