The 4-2-3-1 formation is a popular choice among top clubs, including Chelsea, Manchester United, Real Madrid, and Bayern Munich. Coaches that think about employing the 4-2-3-1 have a lot to go over before they commit to this new formation. It isn't as simple to teach as the 4-4-2 formation, so they need to be sure it's the right fit for their teams. While it is a great formation when executed properly, its weaknesses can be taken advantage of if every player isn’t doing his or her job. The 4-2-3-1 can be frustrating to face because there is usually a player or two in every part of the field. With five midfielders, teams that utilize the 4-2-3-1 can control the game by forcing defenses to pinch in, leaving space down the sidelines. The top teams that run the 4-2-3-1 will often allow their players to have freedom all over the pitch. The 4-2-3-1 forces normally attack-minded players into having to put in a lot more work defensively. Forwards can often get stuck up front on his or her own, causing them to get fewer opportunities and reducing the amount of time the team has possession of the ball. Full backs are often left to deal with the opposing team’s best outside players, and if a counterattacking pass makes it to one of the opposing wingers, the full back will have to stop that winger or he/she will be through on goal.