3-bet strategy: when and how to re-raise preflop

What a 3-bet is and why it matters

Before the flop, the big blind counts as the first bet. An open-raise is the second bet, so the first re-raise is called a 3-bet. If someone re-raises again, that is a 4-bet.

A 3-bet does several jobs at once:

• It builds a bigger pot when you hold a strong hand.
• It takes the initiative, so you are the player expected to bet the flop.
• It folds out hands that would otherwise see a cheap flop and outdraw you.
• It wins the pot right away when the opener gives up, which happens often against loose openers.

Calling an open (often called flatting) keeps the pot small and your range hidden, but it hands the initiative to the raiser and can invite a squeeze from players behind you. Good players use both, but most beginners call far too often and 3-bet far too rarely. If the term is new, the 3-bet entry in our glossary covers the basics.

Value 3-bets: the core of your range

Your 3-betting range starts with hands that are ahead of the hands that will call or 4-bet you. Which hands count depends on where the open came from.

These are guidelines, not laws. Early-position openers have strong ranges, so you need a stronger hand to be ahead. Late-position openers raise much wider, so hands like A♦ J♦ or K♥ Q♥ become clear value.

Some exact all-in numbers explain why these hands love a big pot. QQ against AK offsuit wins 57.0% of the time, so queens are happy to get chips in against a range full of AK. AK suited against QQ wins 46.0%, close to a coin flip, and AK also crushes hands like AQ and KQ that a loose player might call with.

Bluff 3-bets: choosing the right hands

If you only 3-bet premium hands, observant players simply fold everything except their best holdings. Adding a few bluffs makes your value hands get paid and wins pots on its own.

The best bluffs share three features:

1. Blockers. Holding an ace cuts the number of AA combos your opponent can have from 6 to 3, and AK combos from 16 to 12. That makes a 4-bet less likely. See blockers.
2. Playability. Suited hands make flushes and connected hands make straights, so you can still win when called.
3. Not dominated. K♣ 7♦ looks like a bluff candidate but is crushed by every better king when called.

That is why hands like A-5 suited, A-4 suited, K-9 suited and suited connectors such as 7♠ 6♠ are popular light 3-bets, especially from the button and blinds against late-position opens.

How often a pure bluff must work

With blinds of 0.5bb and 1bb, the cutoff opens to 2.5bb. The pot is 4bb. You 3-bet to 7.5bb on the button. Using risk ÷ (pot + risk), a pure bluff needs folds 7.5 ÷ 11.5 = about 65% of the time. It does not have to reach that number on its own, because when you are called you still have equity and position.

Sizing your 3-bet

• In position: about 3x the open. Against a 2.5bb open, make it 7.5–8bb.
• Out of position (from the blinds): about 4x the open, so 10–11bb. Playing the flop without position is harder, so you want more folds and a smaller stack-to-pot ratio.
• Extra callers: add roughly one open size for each player who called. This is a squeeze.
• Short stacks: in tournaments with 25bb or less, a normal 3-bet can commit you anyway. Many spots become 3-bet all-in or fold.

Keep your sizes the same for value and bluffs, otherwise you give away your hand.

A sizing example

You hold K♠ K♦ in the small blind and the cutoff opens to 2.5bb. A 3-bet to 7.5bb lets the cutoff call cheaply and play the flop in position. A 3-bet to 10bb charges their weaker hands more, ends the hand more often when you hold a bluff, and leaves a smaller stack-to-pot ratio, so your kings are easier to play when called.

Adjusting to your opponent

• Tight early-position opener: 3-bet mostly value. Call or fold with the rest.
• Loose late-position opener who folds to 3-bets: widen your bluffs. This player is giving you the pot.
• Player who calls every 3-bet: cut the bluffs and 3-bet more value hands like A-J and K-Q, which beat their calling range.
• Player who 4-bets often: tighten your bluffs, and be ready to 4-bet or call with strong hands.

Your PokerCraft stats can show your own 3-bet frequency. If it is very low, you are probably calling too often.

Playing after you 3-bet

Once called, the pot is large compared with the stacks, so decisions come quickly.

• Bet flops that favour your range. Ace-high and king-high boards are good for the 3-bettor. Our c-bet strategy guide covers sizing.
• Slow down on low, connected boards like 7♥ 6♥ 5♣, which hit the caller’s range harder.
• Know your commitment point. With a low SPR, top pair is often strong enough to get all-in.

Common 3-bet mistakes

• Only 3-betting AA and KK. Your range becomes face-up and nobody pays you.
• Bluffing with weak offsuit hands. They are dominated when called.
• Using the same size in and out of position. Out of position needs a bigger raise.
• Calling 4-bets with hands like A-J offsuit. Against a tight 4-bet range you are usually in bad shape.
• Forgetting who is behind you. A player left to act in the blinds can still wake up with a big hand.

Quick checklist

Before you 3-bet, ask: Where did the open come from? Is my hand value or a bluff? Does it have blockers or playability? Will I be in position? Which size fits? Answer those five and your 3-bets will start to make sense.