GTO
Game Theory Optimal — an unexploitable strategy
Definition
GTO (Game Theory Optimal) is a mathematically balanced poker strategy based on the Nash equilibrium. A GTO strategy makes you unexploitable: no matter what your opponent does, they can't generate positive EV against you in the long run. GTO involves playing mixed ranges — sometimes raising, sometimes calling with the same hand at a precise frequency. For example, you might 3-bet AA 80% of the time and call with it 20% of the time to balance your calling range and keep your actions unpredictable. Learning GTO doesn't mean playing it perfectly — humans can't compute these equilibria in real time. But knowing the GTO fundamentals gives you a solid framework for every decision: which range to open, when to 3-bet, when to c-bet, which hands to defend. Once you have that base, you can deviate to exploit your opponents.
In GTO, you don't 3-bet only with AA and KK. You include bluffs (A5s, A4s) to balance your range and stay hard to read. Without those bluffs, your opponent can fold everything but the nuts against your 3-bet.
Frequently asked questions
Should you play GTO or exploitative poker?
GTO is an unexploitable baseline, ideal against unknowns or strong players; exploitative play maximises EV against opponents who make identifiable mistakes. In practice you start from a GTO baseline and deviate when a clear opponent tendency justifies it.
Can a human play perfect GTO?
No: the exact equilibria (mixed frequencies, multiple sizings) can't be computed in your head in real time. The realistic goal is to internalise the broad strokes — opening ranges, 3-bet and c-bet frequencies — to make near-optimal decisions.