GTO
Game-theoretically optimal play refers to a Nash equilibrium strategy: one where no player can raise their own expected utility by unilaterally switching to a different strategy.
Official source: Heads-up Limit Hold'em Poker is Solved →
Every finite extensive-form game has at least one, and in zero-sum games all equilibria share the same expected value. How close a computed strategy comes is measured by its exploitability, the amount below the game value it concedes against a worst-case opponent. A research paper solving heads-up limit hold'em notes that different equilibria can play differently.
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