I have no idea of the game Go therefore I am not in a position to help you out. Did you read the section on Concept and Philosophy when you search Go(Board game). I am sure you went through it but in the slight possibility that you haven't, it might be of some help.

You could talk about the intricate balance of struggle and control. I don't even know why I am writing this..... but may be you could talk about how this balance of struggle and control is an essential part of daily life and this struggle and control in this tiny domain of a boardgame makes man happy... (I dont know.. I am very uncreative today.... SORRY!)