4-Bet in Poker: The Anti-3-Bettor Preflop Weapon
The preflop 4-bet is one of the most polarizing plays in poker. Done right, it generates high fold equity while building pots with your strongest hands. Done wrong, it turns your range into a transparent game regs exploit. The difference? Knowing exactly which hands to 4-bet, what sizing to use, and against which type of 3-bettor.
This guide is the natural sequel to our complete 3-bet guide. You'll learn to build a balanced 4-bet range, choose the right sizing by position, and react to a 5-bet.
What is a 4-bet?
A 4-bet is the fourth consecutive bet in a preflop sequence:
- Open (initial raise)
- 3-bet (re-raise)
- 4-bet (re-re-raise)
- 5-bet (response to 4-bet, usually all-in)
Example: UTG opens 2.5bb, BTN 3-bets to 8bb, UTG 4-bets to 20bb. You just 4-bet.
Why 4-bet?
Three strategic reasons:
1. For value. You have a premium hand (AA, KK, AK) and want to build a pot you'll win at showdown or via fold equity on a 5-bet jam.
2. To exploit a wide 3-bettor. If villain 3-bets 9-10% of hands, their range contains many bluffs. Your 4-bet bluffs reclaim those pots without showdown.
3. To stay balanced. A pure-value 4-bet range becomes transparent. Adding bluffs keeps your range non-exploitable.
The 4-bet range: value and bluffs
Pure value hands
Always value, in 95% of spots:
- AA, KK: automatic
- QQ: standard value, but consider mixed call against tight 3-bettors
- AKs, AKo: value vs the vast majority of 3-bettors
Conditional value hands
Value only against wide 3-bettors:
- JJ: 4-bet for value vs 3-bet 9%+, otherwise call
- AQs: 4-bet for value vs 3-bet 10%+, otherwise call or fold
Bluff hands
Strict criteria:
- Blockers to villain's value hands (Ax blocks AA and AK; Kxs blocks KK and AK)
- Low showdown value (you don't lose much)
- Good postflop playability if called (suited for flushes and straights)
Examples: A5s, A4s, A3s, A2s (blockers to AA and AK + wheel), KQs (blocker to KK and AK), sometimes K9s-K7s suited (blocker to KK).
EV calculator for the 4-bet
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Get the exact equity against the real villain range with GrindLab.
4-bet sizing: the rule
Optimal sizing depends on position:
| Situation | 4-bet sizing |
|---|---|
| 4-bet in position (IP) | 2.2-2.5× the 3-bet |
| 4-bet out of position (OOP) | 2.5-3× the 3-bet |
| Vs 3-bet from blinds | 2.3-2.7× the 3-bet |
Concrete example at 100bb:
- UTG open 2.5bb → BTN 3-bet 8bb → UTG 4-bet to 20bb (2.5×, OOP)
- BTN open 2.5bb → SB 3-bet 11bb → BTN 4-bet to 24bb (2.2×, IP)
Why this sizing?
A 2.2-2.5× 4-bet provides enough fold equity to fold villain's bluffs, without committing too many chips in case of a 5-bet jam. With a 2.5× 4-bet, you risk ~20% of stack — you can fold bluffs facing a jam.
4-bet range by villain's 3-bet frequency
| Villain 3-bet | Value 4-bet | Bluff 4-bet | Total |
|---|---|---|---|
| Tight (3-5%) | AA, KK | None | 1.2% |
| Standard (6-8%) | AA, KK, AKs | A5s | 1.8% |
| Wide (9-11%) | AA, KK, QQ, AKs, AKo | A5s, A4s | 2.7% |
| Hyper (12%+) | AA-JJ, AKs, AKo, AQs | A5s-A2s, KQs | 3.5% |
→ To adjust these ranges against unbalanced profiles, see our GTO vs exploitative guide.
Facing a 5-bet: how to respond
When your 4-bet receives a 5-bet (often all-in), three options:
Call/jam: AA, KK, almost always. QQ and AKs depending on profile.
Fold: your bluffs (A5s, A4s, KQs) unless against very aggressive 5-bet bluffers.
Mixed: JJ and AKo in certain configurations vs hyper-wide 3-bettors.
Quick math: pot odds of calling a 5-bet jam
If villain 5-bet jams to 100bb total, your call costs 80bb to win a 200bb total pot. You need 40% equity to break-even.
- AA vs standard 5-bet range (KK+, AKs): ~70% equity → call
- KK vs same range: ~50% equity → call
- QQ vs same range: ~38% equity → narrow fold (close decision)
→ Master equity calculations in our poker equity explained guide.
4-bet in cash vs tournament
Cash game
In deep cash (100bb+), 4-bet retains full strategic dimension. You can 4-bet bluff at reasonable frequency because even called, you have postflop room to play your range.
Tournament
With short stacks, many 4-bets effectively become all-ins. With 30bb effective, an 18bb 4-bet commits 60% of your stack — you're pot-committed. Simplify:
- 30bb+: 4-bet/fold remains possible with bluffs
- 20-30bb: 4-bet jam only with value
- <20bb: open jam or fold, no 4-bet
ICM further complicates: near bubble, your 4-bet bluffs become losing because the jam penalty is amplified.
Common 4-bet mistakes
1. 4-bet only value. Your range becomes transparent. Regs exploit you by never 5-bet bluffing.
2. Different sizing value/bluff. "Small 4-bet = bluff" becomes obvious in 50 hands. Identical sizing mandatory.
3. Bluff without blockers. 4-bet bluffing with 76s vs a 3-bet is mathematically losing. Select your bluffs.
4. 4-bet bluff at micro-stakes. Players don't fold. Stay value at NL5-NL25.
5. Folding to 5-bet too often. If you fold 70%+ after your 4-bet, you're exploitable by 3-bettors who jam light.
How to exploit an unbalanced 4-bettor
Villain who 4-bets too often (>3%)
Tighten your 3-bet range to value only. Widen your call range (play postflop with position) rather than continue in the 4-bet game.
Villain who never 4-bets (<1%)
When they 4-bet, it's AA-KK almost exclusively. Fold everything except AA. Increase your 3-bet bluff frequency since they fold the 3-bet.
→ Learn to read villain frequencies in our how to study poker guide.
Key takeaways
- 4-bet = polarized response to the 3-bet: premium value or bluff with blockers.
- Sizing: 2.2-2.5× IP, 2.5-3× OOP.
- Target ratio: ~70% value, 30% bluff to stay balanced.
- Facing 5-bet jam: call AA/KK, fold bluffs.
- In tournament <30bb, simplify to 4-bet jam or call/fold.
Build and save your 4-bet ranges by position in GrindLab's Range Manager. Compare your range vs villain open and 3-bet ranges to validate your strategy. Try free during the beta →