Rochameau Fo Sho: Certainty in Rock-Paper-Scissors

I loved this link, courtesy of Freakonomics.com, on the psychology behind rock-paper-scissors, which is a game also known as rochambeau. Evidently, you should go with scissors every time. The logic? People expect their opponent to start with rock, so they strategically choose paper.

Can we get a game theory diagram on this one??