A solver is poker software that uses game theory algorithms to calculate the mathematically optimal strategy for any given situation by analyzing millions of possible decision paths.
Solvers revolutionized poker strategy by providing concrete answers to questions that players previously answered through intuition or experience. These programs calculate Game Theory Optimal (GTO) play by running complex simulations that consider every possible action sequence and outcome. While no human can perfectly replicate solver output at the table, studying solver solutions helps players understand which strategies are fundamentally sound versus exploitable.
Modern solvers like PioSolver, GTO+ and MonkerSolver have become essential study tools for serious players, though their complexity and computational requirements mean they’re primarily used for post-session analysis rather than real-time decisions.
How to Calculate Solver Solutions
Solvers work through an iterative process called the counterfactual regret minimization (CFR) algorithm. Here’s a simplified overview:
1. Input the game parameters: stack sizes, positions, ranges, bet sizing options
2. The solver creates a game tree with every possible action sequence
3. It runs millions of iterations, adjusting strategies to minimize regret
4. The output shows the optimal frequency for each action with each hand
For a basic example: You input a BTN vs BB single raised pot scenario. The solver might output that on a K♠7♣2♦ flop, the button should c-bet 75% of the time with a 33% pot sizing, mixing specific hands between betting and checking based on their blocking effects and equity.
When Does Solver Work Matter?
Solver solutions become most valuable in common, repeatable spots where small edges compound over thousands of hands. Single raised pots, 3-bet pots, and standard turn/river decisions benefit most from solver study.
Common Mistakes with Solvers
Over-reliance on solver output. Solvers assume both players play perfectly. Real opponents make mistakes you should exploit rather than playing pure GTO.
Don’t Confuse With…
Solvers vs HUDs: Solvers calculate optimal strategy offline. HUDs display opponent statistics in real-time. Solvers show how to play GTO, HUDs help identify opponent deviations to exploit.
Key Takeaway
Solvers provide the game theory foundation for modern poker strategy, but their value comes from understanding the logic behind their solutions, not memorizing specific outputs. They’re study tools, not play-by-play guides.
