I am also a Robocup Junior competitor
Fantastic, what is your team name?, Soccer A Soccer B, primary, secondary?
Are you motors 18w per motor?
No, my students use 4 x 4.5W motors
TNT's robots had 3x 12w motors not 150w
Perhaps I misunderstood or maybe the web information is not updated to October 2010
how did you interface 4 arduino's ?
Using the serial port