To start with, the 4-4-2 is the most balanced formation of all. A manager is provided with strong coverage in every area of the pitch - defensive coverage, offensive coverage, midfield coverage, width. There are no obvious holes in the 4-4-2. It is a sensible formation.
The major strength of the 4-4-2 is the back four. The back four cover the width of the pitch, accounting for every threat from the opposition. This back four is stable; it is the staple, the bread and butter, of the 4-4-2 formation. There is no gaping hole in a back four as there may be in a formation that only provides for three defenders, such as the 3-5-2.
Moreover, a back four always provides opportunities for one member of the defensive unit to get forward. A full-back can join the attack; his team will still be left with three defenders during his foray. All his defensive partners need to do is move over a few metres, ensuring that the defense still accounts for the width of the pitch should a problem arise in the foray of the full-back. Anybody who watches Barcelona will immediately recognize the wild forays of right-back Dani Alves. He often makes attacking runs on the right side of the pitch; his defensive teammates simply shuttle over a few metres. The same applies with Chelsea fans who watch Ashley Cole. He runs forward on the left side; his teammates move over a few metres to cover Cole's side of the pitch in the defensive zone.
Managers can play around somewhat with the other six players in a 4-4-2 formation.
However, traditionally, a manager has play one centre-forward as a point of reference for all of his teammates. Teammates will always be aware that they can get the ball down the pitch to their centre forward to trouble the opposing defense, hold the ball or lay the ball off for oncoming teammates. This traditional centre-forward role is filled by the likes of Kevin Davies on Bolton, Bobby Zamora on Fulham and Didier Drogba on Chelsea, amongst others. If I played on Bolton, I would always know where Davies would be standing; he would be my point of reference on the pitch and I could send him a long ball knowing that he would battle to get it and allow me and my teammates to run forward and join him in the attacking zone. If I played on Fulham, Sunderland, Spurs and many other teams, the same would apply, though of course with a different player filling the role of Davies.
The role of the secondary forward changes by manager. Some secondary forwards will stand near the target man to provide closeness for a quick pass or they will look to run onto flick-ons. Many secondary forwards drop back further to contribute to the midfield, but they are always looking to get forward to meet the striker for a lay-off pass.
The 4-4-2 formation also provides for two central midfielders to both protect the defense and serve as initiators of attack. These two midfielders ensure that there is no easy path through the centre of the pitch for the opposition. They will always return to a defensive position and either tackle the opposition, force the ball backwards or pressure the ball to a wide position. On the attack, these two midfielders must be decisive passers who know instinctively where their teammates are so that they can quickly get onto the ball and pass to either the wing or the forward line and create a speedy attack. With this, it is clear that the central midfielders must serve both a defensive and attacking role. Obviously the central midfielders must possess excellent stamina and a brilliant football mind.
Often managers will enforce a central midfield of two types of players, with one serving a primarily defensive role and the other serving a primarily "passing" or attacking role. Think here of Sir Alex Ferguson, who always enforces two central midfielders; they have been key for every one of his teams. Darren Fletcher and Paul Scholes have been crucial to his team's success this season. However, with Ferguson, his midfielders, though one may be better at defense and the other at attack, always provide a dual role. Don't defend as a central midfielder and you will not play in a Ferguson midfield.
The 4-4-2 formation is also full of partnerships. On a map, one will immediately notice six sets of units in a 4-4-2 formation. There is a back four unit; a midfield four unit; a right-wing unit made from the right-full back and right midfielder; a left-wing unit made from the left full-back and left-winger; a central midfield unit; and a forward unit made from the two forwards.
These units mean that each player in the 4-4-2 unit is responsible for his fellow unit members. He is responsible for knowing where they should be on the pitch at all times so that he can pressure in partnership with them when on defense or, when attacking, alter his position on the pitch to get open or quickly pass to them when in possession. The best players know instinctively where their unit teammates are at all times. This requires football instinct, extensive study and maturity. It is often the speed by which one covers, gets open or lays a pass that determines whether one's team wins or loses.
Here lies the strength of the 4-4-2 formation. Next time your friend asks you why so many managers rely on this formation, you will have the answer.
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