Multiplayer zero sum games In a course I'm taking, the professor mentioned that a zero sum games are only interesting for 2 players.
Can someone explain me that?

By definition of the zero-sum game, the losses of player p1 are entirely added the wining of player p2 and vice verse. If you introduce a third player, p3, and say if p1 losses 5 points, we can't move the 5 points to both players p2 and p3 simultaneously, otherwise the game will not be a zero-sum game. Also, we can't introduce a new distribution rule because the current methods will not then be valid.
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