word type: noun
- A game theory concept explaining that when each player knows the equilibrium strategies of the other player(s), no player has anything to gain by changing their strategy.
Put in more simple terms, Annie and Phil are in Nash Equilibrium if Annie is making the best decisions she possibly can taking into consideration Phil's decisions. At the same Phil is making the best decisions he possibly can taking into consideration Annie's decisions.
For poker players, this theory was actually used in development of pokerbot programming, mainly for Sit and Go games. Specifically, the strategy has practical use in heads-up limit Hold'em environments for push-fold situations.