Poker Solvers – What They Are and How They Work


    Poker has evolved. The best players today don’t rely on instincts or guesswork they study with solvers. A poker solver is software that uses game theory and massive computation to determine the mathematically optimal strategy in a given situation. 

    While you can’t use a solver at the table, studying with one off-table has become essential for anyone who wants to compete at a high level.

    What is a Poker Solver?

    A solver is a program that analyzes poker decisions based on Game Theory Optimal (GTO) principles. You input a hand scenario positions, stack sizes, ranges, bet sizes and the solver calculates the strategies that would make you unexploitable. 

    It doesn’t predict what your opponent will do; instead, it shows what the balanced, theoretically correct play looks like.

    How Do Poker Solvers Work?

    Solvers run millions of calculations to approximate equilibrium strategies. They use algorithms to minimize exploitability by finding mixed strategies sometimes betting, sometimes checking, sometimes folding with the same hand.


    Key inputs for a solver:
    • Preflop ranges for each player
    • Stack sizes and effective depth
    • Bet sizes available at each decision point
    • Board texture
    From there, the solver outputs recommended actions and frequencies. For example, it may suggest that pocket tens on a specific flop should be bet 60% of the time and checked 40%.
    • PioSolver – The original industry standard for detailed postflop GTO study.
    • GTO Wizard – User-friendly with precomputed ranges and training tools.
    • Simple Postflop / Simple Preflop – Popular with pros for precision work.
    • MonkerSolver – Known for multiway pot analysis and advanced simulations.

    When Should You Use a Solver?

    Solvers are most useful in study sessions, not live play. Their strength lies in building your understanding of:
    • Optimal preflop ranges
    • C-bet sizing and frequencies
    • Defense strategies versus aggression
    • Adjustments for stack depth
    By reviewing solver outputs and training with them, you build intuition that carries over into real hands. Over time, you won’t need the software, you’ll internalize the patterns.

    Limitations of Solvers

    • They assume perfect play, which no opponent actually achieves.
    • They require significant computing power for deep analysis.
    • They don’t account for population tendencies unless you adjust inputs.
    • They can be overwhelming without simplification.
    That’s why many players use solver outputs to create simplified tools, like preflop charts or training drills, rather than trying to memorize pure GTO outputs.

    Why Solvers Matter in 2025

    Poker is more competitive than ever. Without solver-based study, you risk falling behind. Recreational players can still win by playing solid fundamentals, but professionals and serious grinders rely on solvers to refine every aspect of their game. They’ve become as essential to poker study as hand histories once were.

    FAQs – Poker Solvers

    What is a solver in poker?

    A solver is software that calculates Game Theory Optimal strategies for poker hands and situations.

    Are solvers allowed in online poker?

    You can’t use them while playing. They are study tools only. Using one in real time is considered cheating.

    Do I need a solver to win?

    At low stakes, strong fundamentals are enough. But as you move up, solver study becomes necessary to stay competitive.

    Which solver is best for beginners?

    GTO Wizard is the most user-friendly, while PioSolver is the most powerful for detailed custom work.

    Do solvers guarantee profit?

    No. They help you understand optimal strategy, but applying it in real time and adjusting to opponents still requires skill.