KEY TAKEAWAYS
CONTENTS
Against a raise, 3-bet your strongest hands and a small set of well-chosen bluffs, call with hands that play well but do not want a big pot, and fold the rest. How wide each group should be depends on four things: your position, the position and habits of the raiser, the stack depth, and how often the raiser folds when re-raised.
This guide assumes a 6-max cash game with 100 big blinds (bb) per player unless stated otherwise. A 3-bet decision is always a response to someone else’s opening range, so players who have not yet settled how wide each seat should open can start with how opening ranges change by position.
The sections below explain what a 3-bet is and what your three options are, how to sort hands into 3-bet, call and fold, a worked example with the math, how the answer shifts with different assumptions, and the mistakes that cost the most.
What a 3-Bet Is and What Your Options Are
A 3-bet is the first re-raise before the flop. The blinds count as the first bet, the opening raise is the second bet, and the re-raise is the third, which is why it carries that name. A re-raise of a 3-bet is a 4-bet. Positions are abbreviated as UTG (under the gun, first to act), HJ (hijack), CO (cutoff), BTN (button), SB (small blind) and BB (big blind).
When someone opens and the action reaches you, you have exactly three choices. Calling and 3-betting are different tools: a call keeps the pot small and leaves the opener’s weaker hands in the game, while a 3-bet builds the pot, takes the initiative and gives the opener a chance to fold.
Folding is a real option, not a failure. Most hands in a deck should be folded to most opens, and the discipline to fold marginal hands is what makes the other two options profitable. The question is never only whether the hand is good but which of the three actions earns the most against this opener, from this seat, at this stack depth.
How to Build a 3-Bet Range and a Calling Range
Think in groups of hands rather than single hands. A 3-bet range has two parts: value hands and bluffs. Value hands are strong enough to be ahead of the cards the opener will continue with, so you want more money in the pot. Bluffs are weaker hands chosen because they hold useful blockers and still have some equity when called.
A blocker is a card in your hand that reduces the number of strong hands the opponent can hold. With an ace in your hand, for example, the opener has fewer combinations of aces. Good bluff candidates combine a blocker with playability, meaning they can make a flush, a straight or a strong pair when called.
The calling range is made of hands that are good enough to continue but gain little from a bigger pot, or that need position to realize their equity. Everything else folds. The table below shows typical roles against a late-position open. It is an illustration of the logic, not a chart to memorize, because the answers move with the assumptions covered later.
| Hand type | Typical role | Why |
|---|---|---|
| Premium pairs and big aces (Q♠ Q♦, A♠ K♦) | 3-bet for value | Ahead of most of the range the opener continues with |
| Strong but vulnerable hands (J♣ J♦, A♥ Q♥) | Mix of 3-bet and call, depending on the opener | Ahead of a wide opener, but often behind a 4-bet |
| Suited aces with low cards (A♠ 5♠) | Common bluff candidate; sometimes a call | Ace blocker plus flush and straight potential |
| Suited connectors and small pairs (7♥ 6♥, 4♣ 4♦) | Usually call in position; fold or mix out of position | Rely on implied odds and playability, not on folds |
| Dominated offsuit hands (K♦ 9♣, Q♦ J♠) | Usually fold | Often dominated when called and rarely improve |
Read the table as a starting point for reasoning. Each row changes role when the opener, the position or the stack depth changes, and the following example shows how one hand is evaluated step by step.
Example Hand: A♠ 5♠ on the Button Against a Cutoff Open
Suppose a 6-max cash game with 100bb stacks and blinds of 0.5bb and 1bb. The spot sets the context: the cutoff, a regular who opens often, raises to 2.5bb. Everyone else folds to you on the button, and you hold A♠ 5♠. The pot before your action is 0.5 + 1 + 2.5 = 4bb.
Your options are to fold, call 2.5bb, or 3-bet to about 8bb, roughly three times the open, a common size when you have position. The ace in your hand is the first argument for 3-betting: it removes 3 of the 6 possible pocket-ace combinations (6 become 3) and 4 of the 16 AK combinations (16 become 12), so the opener is a little less likely to hold the hands that would 4-bet and crush you.
Now the math. After your 3-bet to 8bb the pot is 0.5 + 1 + 2.5 + 8 = 12bb, and the cutoff must call 5.5bb more. His required equity is 5.5 ÷ (12 + 5.5) = 31.4%. For you, a pure bluff needs a fold frequency of at least 8 ÷ (4 + 8) = 66.7% to break even if you treat every non-fold as a total loss. That figure overstates the requirement, because A♠ 5♠ keeps real equity and position when called.
The decision therefore depends on this opener. If he folds to 3-bets well over half the time, the 3-bet is attractive. If he almost never folds, calling in position or folding is better. Also plan for a 4-bet: this hand usually folds to one, so the cost of a 4-bet should already be part of the calculation.
How the Decision Changes at the Table
The same hand can move between 3-bet, call and fold when one assumption changes. Position is the biggest lever. Out of position, for instance in the small blind against a button open, calling is harder because you act first on every street, so many strong hands lean toward 3-betting and weaker hands lean toward folding rather than calling.
Stack depth is the second lever. At 40bb or less, small pairs and suited connectors lose most of their implied odds, so they tend to become 3-bets or folds. With deeper stacks, speculative hands gain value in position, but 3-bet pots also get large relative to the stacks, which raises the stakes of every later decision.
Opponent type is the third. Against an opener who folds often, widen your bluff 3-bets. Against one who rarely folds, trim the bluffs, keep the value hands and call with speculative hands in position. Against a frequent 4-bettor, favor hands that can continue profitably instead of hands that must fold to a 4-bet.
To recognize the spot in real play, ask four quick questions: who opened and from where, how often does he fold to a re-raise, who is still to act behind you, and what is the plan if a 4-bet comes? A player with a clear answer to all four is rarely guessing.
Common 3-Bet and Calling Mistakes
The first mistake is 3-betting dominated offsuit hands such as K♦ 9♣ as bluffs. They have no blocker advantage and play poorly when called, so they lose both when the opener continues and when he folds too rarely. A suited ace usually makes a better bluff because it has playability.
The second is calling too often out of position. A call keeps weak hands in the pot against a player who acts last on every street, so cold-calling out of position is a frequent leak that a mix of 3-bets and folds usually fixes.
The third is using one size and one plan against everyone. A 3-bet that is too small gives the opener a good price to call, and one that is too large risks too much for the fold equity it buys. The fourth is having no plan for a 4-bet, which turns a reasonable 3-bet into a guess.
The last is judging the decision by one result. A good 3-bet can lose and a bad one can win, so evaluate the reasoning and the assumptions behind it, not the outcome of a single hand.
Where This Matters Most in Real Play
In online games, opponents are often more aggressive, so 3-bet ranges and 4-bet ranges are tested constantly and tracking how often a specific player folds to 3-bets is valuable when the software allows it. In live games, many players call raises more often and fold less, which reduces the value of pure bluffs and increases the value of strong hands.
Rake also matters. A rake takes a share of each pot, and rake structures vary by room and stakes, so marginal calls that build a medium-sized pot can be less profitable than they look. Check the rake structure of the games you play before leaning on thin calls.
3-bet pots are bigger, so swings are larger. Even correct 3-bets lose often, and no preflop strategy removes variance or guarantees profit. Play stakes that fit your bankroll and stop when emotion starts to drive decisions.
Related Concepts and the Next Step
Once a 3-bet is called, the 3-bettor is usually the aggressor on the flop, which is where deciding when to continuation bet begins. The 3-bet is only the first decision of the hand, so a flop plan matters as much as the preflop choice.
The idea that a 3-bet range should contain some bluffs follows from balance and unexploitability, covered in what GTO poker means in practice. Theory explains why the mix exists, while the opponent in front of you decides how far to deviate from it.
