Correlated equilibrium, a solution concept in game theory that is more general than the well-known Nash equilibrium Nash equilibrium, a solution concept in game theory involving two or more players Quasi-perfect equilibrium, a refinement of Nash Equilibrium for extensive form games due to Eric van Damme Sequential equilibrium, a refinement of Nash Equilibrium for extensive form games due to David M. Kreps and Robert Wilson Symmetric equilibrium, in game theory, an equilibrium where all players use the same strategy Trembling hand perfect equilibrium assumes that the players, through a "slip of the hand" or tremble, may choose unintended strategies Proper equilibrium due to Roger B. Myerson, where costly trembles are made with smaller probabilities