Poker solvers are programs that calculate mathematically optimal strategies for specific spots with given ranges and parameters. The emergence of solvers fundamentally changed poker theory: what was previously a matter of intuition and experience can now be verified through calculation. Modern regulars at mid-stakes and above work with solvers as a matter of course.
What Is a Solver
Technically, a solver is a program that finds the Nash equilibrium for a given game situation. Input: pre-flop range of both players, pot size, effective stack, flop texture. Output: a detailed strategy for each combination in the range on every street — which hands to bet, which to check, which to call, and which to fold, and in what proportion (as mixed strategies). This output is the GTO solution for the given spot.
Popular Solvers
PioSOLVER — the market standard, available in three versions (free basic, Edge, and Pro), the most widely used among professionals. GTO+ (GTO Plus) — simpler interface, good for beginners learning solver work. Simple Postflop — a web solver with a simplified interface, useful for quick spot checks. MonkerSolver — for Omaha (PLO). nodelock — tool for studying exploit play via solver with locked strategies.
Basic Concepts in a Solver
Range — the set of hands a player holds in a given situation. Node — a decision point in the game tree (flop, turn, or river on a specific board with a specific bet size). EV (Expected Value) — the expected value of a decision, calculated by the solver. Mixed strategy — when a solver recommends randomizing between actions (e.g., bet 70% / check 30%). Frequency — how often each action is optimal for a given hand.
What a Solver Shows
For each hand in the range, a solver shows: the optimal action and its EV, EV of alternative actions, and the EV loss from deviating from the optimal decision. It also shows the overall range EV, range advantage by street, and optimal sizing. This gives a complete picture of the strategic interaction at any given node.
How to Work with a Solver
Process: create a spot (specify ranges, board, bet sizes), run the calculation, study results. Effective learning approach: don’t study random spots, but follow a systematic plan. Start with the most frequent spots — standard c-bet situations in 3-bet pots BTN vs BB, then expand to less common spots.
Solver Limitations
Solvers calculate GTO solutions — strategies that can’t be exploited by an optimal opponent. But in practice most opponents play far from optimally, and the GTO solution is often not the maximum EV play against a specific opponent. Against a fish or a nit, exploit is much more profitable than GTO. Solvers don’t take into account specific opponents’ tendencies — that’s the player’s job.
Solvers and Exploit Play
The most effective use of solvers: first understand the GTO baseline, then deviate from it toward exploit against specific opponents. Nodelock allows modeling this in the solver itself: you lock the opponent to their actual tendencies and see how the optimal strategy changes. This is an advanced technique for NL200+ players.
Cost and Availability
PioSOLVER Free — free version with limited spot depth. PioSOLVER Edge — ~$249, the main commercial version. PioSOLVER Pro — ~$475, for complex multi-street solutions. GTO+ — ~$100, good value for beginners. Cloud solvers (Simple Postflop) — subscription-based, work in a browser without a powerful computer.
Where to Start
The most effective study plan — work through standard spots in logical order. Start with opening ranges by position: check how well your open-raises match GTO. Then — “BTN open vs BB defend” spots on different flops. After that — 3-bet pots IP, then OOP. At each step, record 2–3 main takeaways and transfer them to practice.
Adapting Solver Work to Different Stakes
At NL2–NL10, a solver mainly shows “bet less bluffs, more value” — because the field doesn’t fold. This conclusion can be reached without a solver, so buying PioSOLVER at these stakes often doesn’t pay off. At NL25–NL100, solver work already provides real EV gains. At NL200+, it’s simply necessary.
Common Mistakes
- Memorizing frequencies without understanding the logic
- Ignoring the exploit dimension — studying only pure GTO
- Incorrect range setup — garbage in, garbage out
- Not fixing main conclusions from sessions in a note
- Buying an expensive solver without mastering the free version first
A solver is a tool for understanding the logic of optimal play, not a substitute for thinking at the tables. The goal of solver work is to internalize the principles behind GTO solutions, not to memorize specific frequencies. A player who understands why a solver bets 33% in one spot and 75% in another will make better real-time decisions than one who simply copies outputs.
Solvers work best when combined with a large database of actual opponents — this way the GTO baseline can be properly adjusted toward the right exploits in practice.