The Nash Equilibrium is a theoretical concept of playing poker, in which every player in the game employs the mathematically perfect GTO poker strategy. Deviating from this play in any way would be a mistake for each player, as the players are in equilibrium with each other and are playing optimally.
Nash Equilibrium Poker Example:
Let’s say that two players are playing the game perfectly and not straying away from optimal decision-making, regardless of what their opponent is doing. They have achieved the Nash Equilibrium strategy, and the result is a stalemate that can only be broken if one player deviates from the strategy and loses.