strategy
Solver
Also: poker solver, PioSOLVER, GTO Wizard
Software that computes equilibrium strategies for a poker situation given the ranges, stack sizes and bet sizes you define. Solvers are how modern GTO knowledge is produced.
Example. A student runs a solver on a 100 bb button-versus-big-blind spot and learns the big blind should check-raise about 12% of the time on a low paired board.
A solver takes an input — two ranges, a board, stack depth and a bet-size tree — and runs an algorithm until neither player can improve by changing their strategy. The output shows, for every hand in each range, how often to bet, check, call, raise or fold at each node. Popular tools include PioSOLVER, GTO+, Simple Postflop and the browser-based GTO Wizard, and pre-flop solvers such as MonkerSolver handle multiway spots. The results are only as good as the inputs, which is why 'solver says X' always assumes a particular tree.