In this book, the prolific William Poundstone presents strategies gleaned from numbers theory, statistics, probability and human behavior that his further research indicates can improve your chances of more accurately predicting situations such as whether a pitcher will throw consecutive fastballs, the frequency of a card player's bluff; how to outwit the stock market and outguess office football pools, and, of course, how to win at rock-paper-scissors.
ROBERT GIBBONS, GAME THEORY FOR APPLIED ECONOMISTS 30 (1992) ("In any game in which each player would like to outguess the other(s), there is no Nash equilibrium [with pure strategies] because the solution to such a game necessarily involves uncertainty about what the players will do.").