Plain-English definitions of the terms used across the Pokerai API and these ranges.
Updated · Maintained by Pokerai API · Source Docs
GTOgame-theory-optimal
A strategy that can't be exploited no matter how opponents adjust. It doesn't give one "best" move; each spot has a balanced mix of actions at specific frequencies. Pokerai returns those frequencies.
Solver
Software that computes the GTO strategy for a spot by iterating (counterfactual regret minimization, CFR) until both players' strategies converge to equilibrium. Solving is compute-heavy — Pokerai serves millions of presolved spots instantly and solves the rest on demand.
Mixed frequency
When GTO plays a hand more than one way — e.g. 99 might raise 64%, call 11%, fold 25%. You randomize per those frequencies so you stay unexploitable. A pure hand does one action 100% of the time.
RFIraise first in
Opening the pot with a raise when everyone before you has folded — an "opening range". Later positions open wider; UTG opens tightest.
3-bet / 4-bet
The 3rd and 4th raises in a betting sequence. The blinds count as bet 1, the open-raise is bet 2, so re-raising the opener is a "3-bet", and re-raising that is a "4-bet".
Isomorphic board
Boards identical up to suit relabeling — A♠K♠2♠ and A♥K♥2♥ play the same. Collapsing these suit-symmetric duplicates to one canonical board is why ~66K flop spots cover every real flop.
EVexpected value
The average chips a decision wins or loses over the long run, in big blinds. GTO maximizes your EV assuming a worst-case opponent; the /v1/gto/evs endpoint returns per-action EVs.
Blocker
A card in your hand that removes combos from your opponent's range — e.g. holding the A♠ makes it less likely they have the nut flush. Blockers shape which hands bluff or call.
SPRstack-to-pot ratio
Effective stack divided by the pot at the start of a street. Low SPR (short stacks, big pots) favors committing; high SPR leaves more room to maneuver. It's why 40bb and 100bb ranges differ.
Range
The full set of hands a player can have in a spot, each with its action frequencies. Pokerai's range pages and /v1/gto/preflop/range return all 169 starting hands at once.