Actually, it's not aggressive, but just more competitive. Sport games, if not played on keyboards or game pads but "active" controllers like Kinect, TrackIR etc, can sometimes turn out into a lightweight excercise. I played tons of classic DOS sport games (mostly soccer and tennis), they were not aggressive - just like table soccer or ping pong. People on Common Sense Media may be very hilarious - they may even think that chess encourages kids to be more evil, while draughts (checkers) are MORE violent than chess!!!