That was too easy for Carlsen. Why give him white for all the games? That is typical for a simul, but given the strength of his opponents, it probably would have been better alternating (black/white, not all white or black).
Yeah the rule should be if you are under 2000, there is a lottery for those those players to choose their color. No more than half of them would get to choose white to keep it reasonable.
But if I were playing a player like Magnus, my goal might not be to win. When I have played in these sorts of simuls before, I approached them in the wrong way. For example, I tried to create the most complex position possible, by say playing a Benko Gambit. The idea is to gain the initiative at all costs and go into complicated tactical battles. I have won simul some games this way against much stronger players than me.
Against Magnus, my goal would be to attain a position that was rich in strategy, and see how he goes about beating those kinds of positions. In other words, I want to get him into a position that he really enjoys and he wants to analyse afterwards! Thing is, he would have to be up for it. At this level, all he mostly has to do is wait for an error, and then turn the position into a technical win. Not very instructive. So for example, it would greatly affect my choice of openings. A position that might have made it into "Zurich 1953".
For fun with my students, when I have a group, I will sometimes play 5:5 against all of them at once, alternating white and black. The most I did was 5 boards ranging in ratings of 1400 - 1700. It is really funny they love to see me go crazy back and forth. They help each other in trying to beat me, and tell each other not to give up so that together they can gang up on me and at least win on time.
They are right!
