Solver
Software that calculates GTO (game theory optimal) strategies for any given poker situation.
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What Is Solver?
Solvers use algorithms like counterfactual regret minimization to compute mathematically balanced strategies that cannot be exploited, given a defined set of ranges, bet sizes, and board. Modern solvers such as PioSOLVER and GTO+ are widely used by serious players and coaches to study optimal frequencies for betting, raising, checking, and folding across countless spots.
Examples
Running a solver to find the optimal continuation-bet frequency on a K-7-2 rainbow flop.
Using solver output to study how a range should defend against an overbet on the river.
Strategy Tips
Solvers are best used as a study tool away from the table, not as something to reference during play. Focus on extracting general principles and heuristics from solver output rather than trying to memorize exact frequencies for every spot. Combine solver-based GTO study with exploitative adjustments based on real opponent tendencies, since most opponents deviate from optimal play. Node-locking, where you fix an opponent's strategy to reflect their actual tendencies, is a powerful way to find exploitative counters using solver software.