Beginners think about their two cards. Intermediates think about their opponent's two cards. Winners think about every two cards their opponent could have, weighted by frequency. That is range thinking — the gateway drug to GTO.
What is a range?
A range is the full set of hands a player can have given their actions. When a tight regular opens UTG, their range might be 88+, AJs+, KQs, AQo+ — roughly 9% of all hands. Your job is to play optimally against the whole range, not the specific two cards you imagine.
Ranges shrink with every action. A UTG open then a 3-bet then a 4-bet might leave a range of just QQ+, AK — under 3% of hands.
GTO in one paragraph
Game-theory-optimal play means choosing a strategy that cannot be exploited, regardless of what your opponent does. In practice it means betting hands and bluffs in the right ratio so that your opponent is indifferent between calling and folding. On the river, the classic ratio is 2:1 value-to-bluff for a pot-sized bet.
Range construction in practice
- Pre-flop: build a balanced opening range, then a balanced 3-bet range with value and bluffs.
- Flop: c-bet a polarised range (strong hands + draws) on dry boards; check-back medium-strength on wet boards.
- Turn: barrel hands that pick up equity (gutshots, overcards); give up hands that lose equity.
- River: balance value-bets with the right ratio of bluff combos.
When to deviate from GTO
GTO is a defensive baseline. Against live, exploitable opponents you make more money playing exploitatively — bluffing the nit who folds too much, value-betting thinner against the calling station. GTO is what you fall back to when you have no read.
Key takeaways
- Think in ranges, not hands.
- GTO is an unexploitable baseline, not the maximum-EV strategy against weak players.
- Use solver outputs as guides, not gospel — live games reward exploitation.