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While it seems defensive to the eye, it is quite a flexible formation, as both the wide players and the full-backs join the attack. In defense, this formation is similar to either the 4-5-1 or 4-4-1-1. It is used to maintain possession of the ball and stopping opposition attacks by controlling the midfield area of the field. The lone striker may be very tall and strong to hold the ball up as his midfielders and full-backs join him in attack.