Links

These websites provide further information on Nao robots playing soccer and their competition:

Official Website RoboCup Germany 

German national RoboCup committee Standard Platform League 

Website of the Standard Platform League (SPL)

Aldebaran Robotics - Home of the Nao robots RoboCup 

Here are further information on the RoboCup and soccer playing robots. The international competition which took place this year: http://www.robocup2016.org/en/participants/