Well, I noticed that ALL the best managers of the game don’t use wingers! Basically, all they do is to put the whole team to play on the center. The question is: why? Is that because of their lack of eficience at atacking/defending?

There is a simple explanation, Humberto. Sometimes, when you use wingers, they do not receive or get the ball very often. This improved a little after the more realistic player movement and distance calculation implemented a while back, but this central behaviour is likely to change after we implement another enhancement that will add a new strategy option: play in the center, using wingers or mixed.

i would also like to refer you to http://www.rubysoccer.com/forums/3/topics/738