My kids love table tennis. I try to encourage them to work together as a team instead of always competing against each other. Yesterday we did some doubles training with the robot. Check it out!
When starting a doubles match, the servers and receivers are chosen just like in singles. One pair hides the ball, and the other pair guesses which hand that the ball is in. If you choose correctly, I would recommend choosing to receive serve, not to start with the serve. So why should you choose to receive?