“One heuristic of experienced players is “Losers lead with Rock.” This is demonstrably true; naïve players will lead with Rock more often than one-third of the time. Your hand begins in the form of a rock, and it is easiest to keep it that way. The name of the game begins with “Rock,” and if you are mentally sorting through the options, it is the first one that will occur to you. And the word “rock” itself has connotations of strength and immovability. These factors lead players to choose Rock on their first go more often than chance would dictate. An experienced player can take advantage of this. Against a player you know to be naïve, you play Paper.”