Poker 4-Bet Strategy: Ranges, Sizing & When to Pull the Trigger
Most players either 4-bet too tight (only AA/KK) or too randomly. A GTO 4-bet range is balanced — heavy with value hands and supported by well-chosen bluffs. Here’s the complete breakdown.
What is a 4-bet in poker?
A 4-bet is the fourth raise in a betting sequence preflop. The open raise is bet 1, the 3-bet is raise 2, and the 4-bet is raise 3. When someone 3-bets your open and you re-raise back, that’s a 4-bet.
For example: you open to 3bb from the cutoff, the button 3-bets to 9bb, and you re-raise to 21bb. That’s a 4-bet. The pot is already large, both players are representing significant strength, and the decisions carry major consequences for your stack.
4-bet pots are some of the most consequential spots in No Limit Hold’em. Playing them correctly — with the right mix of hands, the right sizing, and the right reads — is a clear separator between recreational players and serious winners.
How GTO builds a 4-bet range
A balanced GTO 4-bet range has two components: value hands you want to build the pot with, and bluffs you add to stay unexploitable. Without bluffs, a thinking opponent simply folds everything but AA/KK when you 4-bet.
BTN vs CO 4-bet range (100bb, 6-max cash)
The exact frequencies shift based on position, stack depth, and the 3-bettor’s range. That’s why studying solver outputs is valuable — the optimal 4-bet frequency from EP is different from the BTN, and GTO solutions will show you exactly which combos to include.
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Why suited aces make the best 4-bet bluffs
When you 4-bet bluff, you want hands with two specific properties: good blockers to your opponent’s continuing range, and decent equity when called.
A5s ticks both boxes. The ace in your hand removes two combos of AA and two combos of AK from your opponent’s value range — the exact hands most likely to call your 4-bet. When A5s does get called and hits a flop, it can make the nut flush or trips with strong equity.
Contrast this with a hand like 87s. It has zero blocking value against AA/KK/AK and very little equity when called by those hands. The solver avoids 87s as a 4-bet bluff because it gives you the worst of both worlds.
The blocker principle
Every ace you hold reduces the number of AA combos your opponent can have from 6 to 3. Every king reduces KK from 6 to 3. This makes hands like A5s, A4s, K5s, and KQs valuable as 4-bet bluffs — they’re more likely to fold out the hands that would otherwise stack you.
4-bet sizing: in position vs. out of position
Sizing is where many players leak chips. The two most common mistakes are 4-betting too small (giving the 3-bettor a great price to call) and 4-betting too large (turning hands like AA into an effective shove at 100bb).
| Spot | Stack depth | Standard sizing |
|---|---|---|
| In position (IP) | 100bb | 2.2–2.5x the 3-bet |
| Out of position (OOP) | 100bb | 2.5–3x the 3-bet |
| Either position | 50–70bb | Often jamming or near-jam |
| Tournament (deep) | 100bb+ | 2.2x, keep SPR playable |
| Vs. BTN 3-bet (from SB) | 100bb | 3x minimum (OOP penalty) |
The OOP sizing premium exists because your opponent will have a positional advantage for every street of a called 4-bet pot. A larger sizing means they need more equity to call profitably, partially offsetting your positional disadvantage.
At 50–70bb effective, the math often makes a shove better than a raise-fold. If you 4-bet to 20bb with 60bb behind, you’ve committed a third of your stack and left an awkward SPR for the flop. In those spots, many GTO solutions default to jamming the stronger value hands and folding the bluffs.
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Hand example: A5s in the BTN vs. CO 3-bet
Hand scenario
Setup: $2/$5 cash, 9-handed, 100bb effective. You open BTN to 3bb with A♥5♥. CO 3-bets to 10bb. Action folds to you.
Options: Fold, call, or 4-bet to ~24bb.
GTO solution: 4-bet ~60–70% of the time. A5s has the ideal blocker (the ace) and retains equity vs. calling ranges. When you 4-bet and get called, you can continue on A-high boards with top pair and bluff-catch/semi-bluff on suited board runouts.
Many players “just call” this spot. The problem is A5s plays poorly in multiway pots and OOP to a BTN 3-bet — calling locks you into a tough 3-bet pot without initiative. 4-betting takes the pot down immediately a meaningful percentage of the time and builds dead money when called.
When to call the 3-bet instead of 4-betting
Not every strong hand should be a 4-bet. In fact, many premium hands play better as calls in position. The general framework:
Too strong to give free equity; need to build pot now
Position changes whether you can profitably call
Set-mines well; loses equity in 4-bet pots vs. AK
IP: realize equity cheaply. OOP: too hard to play postflop
King blocker has value, but hand plays well as call IP
The key insight: calling a 3-bet in position with hands like TT or AQs is not weakness. You’re choosing to realize equity in a lower-variance spot where you have a positional advantage for the rest of the hand.
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How to defend when you get 4-bet
The other side of the coin: what do you do when your 3-bet gets 4-bet? Most recreational players fold too much here, turning their 3-bet range exploitable. GTO requires you to call or 5-bet with a meaningful portion of your range.
Your defense strategy depends on what you 3-bet with. If you 3-bet a polarized range (strong hands + bluffs), you can defend the strong top-end combos and fold the bluffs. If you 3-bet a linear range (merged), you have more calls and fewer obvious folds.
Defending vs. a 4-bet (BTN 3-bet, EP 4-bets, 100bb)
The general rule: if you 3-bet light as a bluff, fold those hands to a 4-bet. They’ve done their job by applying pressure. Continuing with KQs or A5s vs. a 4-bet turns a profitable bluff into an unprofitable call-down.
Hand example: QQ facing a 4-bet from UTG
Hand scenario
Setup: $1/$2 online, 6-max, 100bb. UTG opens to 2.5bb. You 3-bet from BTN to 8bb with Q♠Q♦. UTG 4-bets to 22bb.
Mistake: Many players fold QQ here, assuming UTG “always has KK or AA” when they 4-bet from early position.
GTO answer: Call (and sometimes 5-bet jam). UTG’s 4-bet range at GTO includes JJ, AK, and bluffs — not just AA/KK. QQ has roughly 44% equity vs. UTG’s 4-bet range, which is well above the pot odds needed to call a 22bb 4-bet.
Folding QQ to a single 4-bet is a major leak. Even at stakes where opponents rarely bluff 4-bet, you’re still priced into a call with any range containing JJ+ and AK. Tighten this read at live $1/$2 where players genuinely never 4-bet bluff — but even there, QQ is usually a call.
The 3 most common 4-bet mistakes
4-betting only AA/KK
This is the most common mistake at low and mid-stakes. If you only 4-bet the top two combos, observant opponents will fold everything to your 4-bets and only play a pot with you when they have AA or KK themselves — neutralizing your strongest hands.
Using wrong bluff candidates
Players often 4-bet bluff with their worst hands (fold-equity speculation) rather than their best blocker hands. 87s is a bad 4-bet bluff. A5s is a great one. The difference is the ace — it directly reduces the number of hands that beat you.
Wrong sizing relative to 3-bet
4-betting to 2x the 3-bet is too small — it gives your opponent an easy call with hands like AQs and JJ. Aim for 2.2–2.5x IP and 2.5–3x OOP. The larger OOP sizing compensates for the positional disadvantage you’ll face on every postflop street.
Adjusting 4-bet strategy for live poker
Live poker, especially at $1/$2 to $5/$10, has a well-documented leak: players rarely 4-bet bluff. This means you can tighten your 4-bet calling range and widen your 4-bet folding range vs. passive unknowns — but only against players you’ve specifically identified as non-bluffers.
Against a live player who has 4-bet twice in 30 hands, treat their range as close to AA/KK only. You can fold JJ and AQ without remorse. Against a live LAG or a young player using a solver-based strategy, defend as you would online.
The flip side: your own 4-bet bluffs become more profitable in live games. Most live players don’t suspect 4-bet bluffs and fold too often. Adding A5s and A4s into your 4-bet range vs. live players is an immediate EV booster once you understand the underlying theory.
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Frequently asked questions
What percentage of hands should I 4-bet?
It varies by position and the 3-bettor’s range, but most solvers 4-bet roughly 4–8% of all preflop hands in typical 6-max spots. The number is lower from early position (where ranges are tighter) and higher on the BTN where you open wide and face more steal-attempts.
Should I 4-bet AK or just call?
At 100bb, AK is typically a mix — some percentage 4-bet, some call. 4-betting wins the pot preflop more often and denies equity; calling preserves stack-to-pot ratio and keeps the board texture relevant. In position against a BTN 3-bet, calling AKs is fine. Out of position, 4-betting is slightly preferred.
Is it ever right to 4-bet TT?
Rarely at 100bb and below. TT prefers to call a 3-bet in position, set-mine, and exploit postflop equity. As a 4-bet, TT runs into AA/KK/QQ/JJ/AK and doesn’t have blocker value. Some solvers 4-bet TT at a low frequency from the BTN, but defaulting to a call is simpler and close to optimal.
How should I play against a 4-bet with a hand I 3-bet as a bluff?
Fold. If you 3-bet KQo or A5s as a bluff and face a 4-bet, fold immediately. The bluff accomplished its goal of putting in dead money and winning some pots uncontested. Calling with those hands vs. a 4-bet turns a good bluff into a bad call.
What’s the difference between a 4-bet pot and a 3-bet pot?
A 3-bet pot means the preflop action ended with a call of the 3-bet, creating a medium-to-large pot with a relatively deep SPR. A 4-bet pot means a 4-bet was called, creating a very large pot with a low SPR — often under 2, which dramatically changes postflop strategy toward commitment.
Can I 4-bet in early position?
Yes, but your range should be tighter. EP 4-bets represent massive strength and opponents will fold almost everything. Your value hands (AA, KK, maybe QQ and AK) are obvious. Bluffing with A5s from UTG vs. a BTN 3-bet is less optimal than in other positions because your opening range was already tight, making your 4-bet range hard to balance.
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