Rollback (often referred to as backward induction) is an iterative method for solving finite in depth kind or sequential games. First, one determines the optimal strategy of the player who makes the last move of the sport. Then, the optimal action of the next-to-last moving player is decided taking the last player's action as given. the method continues during this manner backwards in time till all players' actions are determined. Effectively, one determines the Nash equilibrium of every subgame of the initial game.