Texture switches sides on the river
Triple-barrel% (aggressor, after bet-bet) vs fold% (defender, facing the third barrel) · single-raised pots BTN vs BB
- The third barrel is nearly texture-blind. After betting flop and turn, the population fires at a similar clip on almost every river — a fraction of the spread the same cards produce on the flop.
- The fold side is where texture lives now. Folding to the third barrel swings 26 points by river class — the widest defensive texture response of any street.
- Pairing rivers are calling rivers. Trips on the board is the least-folded river in poker (41%): nobody folds a hand the whole table shares.
- Scare cards actually scare. A fourth flush card folds out 67%; a board that turns all-broadway, 62%.
- Two pair on the board is the river to raise. Lowest barrel (38%) and the highest check-raise rate on the street (10%).
The experiment
We used the same method as our flop and turn studies: measure what regulars actually do on every possible card, hand a decision tree the raw ingredients — rank relation to the board, suit transitions, straight windows, pairing — and keep only the boundaries that replicate on independent halves of the player pool. The spot: the aggressor bet flop and turn and got called twice, and now decides on the river — 146,000 triple-barrel decisions — while on the other side the defender, having check-called twice, faces the third bullet (44,000 decisions).
The axis that vanishes
On the flop, texture explains most of what the population does (the board’s gap structure). On the turn, less, but still plenty (the card’s relation to the board). On the river, it nearly disappears: the best class map we can build explains a fraction of what it does one street earlier. It makes sense once you say it out loud — a player who has already bet twice has committed to a story; by the river his decision is driven by his own hand and the pot odds he is laying, not by the card that just landed.
The axis that reappears — on the other side
The defender, who has check-called twice, is the one actually listening to the river. His fold-vs-barrel by class is the steepest texture ladder we found on any street, on either side:
Fold vs the third barrel, by river class
BB after check-calling flop and turn, single-raised pots · 44k decisions
Which card pairs, one street later
Our turn study found that pairing the board’s middle card is among the most bet-hostile cards in the deck. The river says the same thing in its own vocabulary. Pairing the second board card collapses barreling to 39.4% and draws one of the lowest fold rates of the street (46.7%) — the cards a caller peels with live in the upper-middle of the board, so pairing there is where his range improved and yours did not. Pairing the bottom card barely registers (51.6%). And on a board that was already paired, a river that pairs a second rank puts two pair on the board: 37.9% barrel, and the highest check-raise rate on the street (10.0%) — everyone holds the same two pair, so the only way to win the pot is to take it. Its mirror, trips on the board, is the least-folded river in poker at 41.0%.
The map
Seventeen river classes, mirroring the turn map
Barrel% (single-raised BTN vs BB IP) · fold% and check-raise% (BB vs the third barrel)
| Class | Definition | Example | Share | Barrel | Fold | X/R |
|---|---|---|---|---|---|---|
| Overcard — clean: no flush, no straight arrives | ||||||
| Broadway Overcard | K, Q or J above all four cards | Q on T♦7♠4♥2♣ | 3.9% | 59.6 | 56.5 | 6.3 |
| Ace Overcard | an ace arrives | A on T♦7♠4♥2♣ | 1.8% | 55.8 | 52.4 | 5.8 |
| Mid Overcard | 7–T, still above the board | 9 on 6♦4♠3♥2♣ | 0.9% | 54.8 | 60.1 | 4.9 |
| Blank | ||||||
| Blank | nothing lands at all | 4 on K♦9♠6♥2♣ | 22.2% | 54.7 | 55.6 | 5.3 |
| Flush Completes | ||||||
| Flush + Overcard | overcard that completes a flush | Q♠ on 8♠5♠2♥K♦ | 2.9% | 50.2 | 60.1 | 10.1 |
| Flush + Undercard | card under the highest board card that completes a flush | 7♠ on K♠9♠6♥2♣ | 14.3% | 47.0 | 56.8 | 9.0 |
| Straight Completes | ||||||
| Triple Broadway | third broadway card lands (any of them) | J on K♦T♠7♥2♣ | 7.0% | 53.6 | 62.4 | 4.5 |
| Overcard + Straight | overcard that completes a straight | 9 on 7♦6♠4♥2♣ | 1.9% | 56.5 | 58.8 | 6.0 |
| Undercard + Straight | card under the highest board card that completes a straight | 8 on T♦7♠2♥K♣ | 15.5% | 50.9 | 54.1 | 5.7 |
| River Pairs | ||||||
| Top Card Pairs | pairs the highest board card | K on K972 | 3.3% | 47.6 | 51.1 | 6.8 |
| Second Card Pairs | pairs the second-highest | 9 on K972 | 3.4% | 39.4 | 46.7 | 7.9 |
| Third Card Pairs | pairs the third-highest | 7 on K972 | 3.8% | 47.0 | 49.5 | 8.2 |
| Bottom Card Pairs | pairs the lowest board card | 2 on K972 | 4.0% | 51.6 | 53.5 | 5.2 |
| Two Pair on Board | pairs a second rank — the board is now double-paired | 7 on K997 | 2.7% | 37.9 | 46.5 | 10.0 |
| Trips on Board | pairs the already-paired rank | 9 on K997 | 1.0% | 45.8 | 41.0 | 7.8 |
| Four Card+ | ||||||
| 4-Straight | puts four (or five) to a straight on the board | 6 on 7♦5♠4♥K♣ | 8.4% | 44.1 | 61.1 | 6.8 |
| 4-Flush | fourth (or fifth) card of a suit | 2♠ on K♠9♠6♠4♥ | 3.0% | 44.8 | 67.1 | 6.4 |
The scorecard
On the same taxonomy-agnostic grid of river situations, a traditional 17-class river map explains 0.063 of class-explainable barrel variation (split-half: 0.044), 0.046 of the folding and almost none of the raising. The seventeen classes above score 0.163 on the barrel (split-half 0.109), 0.119 on the fold and 0.065 on the raise — double to sixfold, from the same number of classes. Both barrel numbers stay small, and that is the finding: the river card does not move the bettor much. It moves the caller — and for the caller, this map more than doubles what the traditional one sees.