What Is a Capped Range—and When Can You Attack It?

Your opponent calls twice, checks the river, and seems unable to have the nuts. That is the idea behind a capped range. But “they look weak” is not enough. You need to trace the action and identify which strong hands are actually missing.

The short answer

Attack when your opponent's earlier checks and calls make their strongest hands unlikely, while your earlier actions still allow you to have the nuts. Use a large bet only if you can name your value hands and the weaker hands you expect to fold.

Three useful words

A range is the full group of hands a player can reasonably hold. A capped range is missing most of the strongest possible hands. An uncapped range can still contain the best possible hand, often called the nuts. The earlier action creates the cap—for example, when most strong hands would have raised instead of called.

Two quick examples

• Reasonable: The big blind check-calls K-8-4, check-calls a 2, then checks another 2 on the river. A large bet can pressure one-pair hands if most sets would have raised earlier and you can still have trips or a full house.
• Not reasonable: You overbet every time somebody checks three times. First ask what happened to each strong hand. If a player often slow-plays sets and trips, those hands are still possible and the checks are not as weak as they look.

Practice this spot first

Decide whether the big blind is truly capped in the river spot below. Name one strong hand they can still have before you reach for the overbet.

PRACTICE SPOT · GTO DOJOPlay this spot ↗

Trace the missing value backward

Start with the strongest possible river hands and work backward one street at a time. Would a set usually check-raise the flop instead of call? Would two pair raise the turn? Could the player have called preflop with a hand containing a two, then called the turn with a pair? Remove a strong hand only when an earlier decision makes it genuinely unlikely.

A range is not simply “capped” or “uncapped.” It may still contain a few monsters while holding far more one-pair hands. The balance between those groups is what matters.

Make sure you can have the nuts

An opponent's weakness does not make your hand strong. Before overbetting, name the hands you would bet this way for value. Then add bluffs that benefit when one-pair hands fold. If neither player can credibly have the nuts, a huge bet may tell an unconvincing story.

Decide which hands are strong enough to bet

In the practice hand, the river pot is about 11.5 big blinds (11.5bb). An overbet around 14–15bb asks one-pair kings such as king-queen and king-jack to make a very hard call. Before bluffing, build the value bets. The button can use full houses such as king-two suited and some checked-back sets, plus strong hands containing a two that became trips on the river. Only then ask whether A♥ 5♥ should bluff. It is a candidate only if the button has enough of those value hands and the big blind still reaches the river with many one-pair kings that can fold.

Choose bluffs that leave folds available

Prefer bluffs that make the opponent's strongest calls less likely without removing the weak hands you want to fold. Ace-five makes some ace-high hands impossible, so the big blind has fewer easy folds. Compare it with a lower missed hand before betting.

Player habits matter. If an opponent slow-plays strong hands, their river checks are not as weak as they look. If they always raise strong hands earlier, a river overbet is safer.

Rule of thumb: A capped range is evidence about missing combinations—not permission to overbet every time someone checks.

Test the cap with counterexamples

Take the K♠ 9♦ 4♣ 2♠ 2♦ river above. List 99, 44, and strong king-x before calling the big blind capped. First assume the opponent raises every set by the turn. Then assume they slow-play half of those sets. Predict whether ace-five still wants to overbet 14–15bb. Only the slow-play habit should change your answer.

Keep studying

Build the uncapped comparison range with a decision-by-decision range-construction method, see how a missed flop bet can create profitable turn probe opportunities, and convert the river advantage into thin but disciplined value bets.