The 4-3-3
The 4-3-3 came with different strategies as demonstrated by the German team in 1972. Behind marking backs played a Libero (sweeper), who moved into the midfield position when the team won possession of the ball.
The 4-2-2
The 4-4-2 developed into a 3-5-2, since four defenders were only facing two forwards. One of the defender positions moved into the midfield position (since 1980).
The 2-6-2
L. van Gaal (coach of Ajax Amsterdam) developed in 1991 the dynamic 3-4-3, which could easily turn into a defensive 4-3-3, 4-4-2 or 3-5-2
(Please click here for Part I)