What is a 3-Bet?

In Texas Hold'em (especially No-Limit Hold'em), "3-Bet" is a core term. It refers to a re-raise made preflop after a player has already raised (called an Open Raise or 2-Bet). Since the initial blind bet is often considered the 1-Bet, the first raise is the 2-Bet (Open Raise), and a subsequent raise on that is the 3-Bet. For example, with blinds at $0.5/$1, a player opens from UTG to $3, and then another player on the CO raises to $9 – that $9 is a 3-Bet.

Note: The number "3" in "3-Bet" does not directly correspond to the third betting action, but rather to the level of raise in this specific context. In practice, preflop, the small blind and big blind bets can be seen as the 1-Bet (blinds), but industry convention is to treat the first active raise as the 2-Bet. If a player goes all-in or makes a min-raise, the situation may vary slightly, but the concept remains the same.

Purpose of a 3-Bet

A 3-Bet primarily serves the following purposes:

1. Value: When your hand is stronger than the opponent’s opening range, a 3-Bet immediately builds the pot, setting up larger profits at showdown. Typical strong hands include AA, KK, AK, QQ, etc.
2. Bluff: Using a weaker hand (often one with blockers or backdoor draw potential, such as A5s, KQo, etc.) to 3-Bet forces opponents to fold many medium-strength hands, winning the pot outright.
3. Isolation: If you are in position and the opponent’s opening range is wide, a 3-Bet can force later players to fold, letting you go heads-up with the original raiser, gaining positional and informational advantage.
4. Information: By 3-betting, you observe whether the opponent continues (4-bet, call, or fold), narrowing their range and aiding postflop decisions.

Timing and Position for 3-Betting

Position is one of the most important factors in 3-betting decisions. Generally, when out of position (e.g., from the blinds), you should tighten your 3-bet range because you will be at a disadvantage postflop. In position (e.g., on the button), you can 3-bet more widely since you get to act after the opponent.

Typical examples (assuming 6-handed, 100BB effective stacks):

• UTG Open: UTG’s opening range is typically strong (about 10%-15% of hands). Therefore, you need stronger hands to 3-bet. For example, you might 3-bet with JJ+, AK, AQs+, and some blocker combos (like ATs, A5s). Frequency should be low, around 8%-10%.

• CO Open: CO opens with a wider range (about 20%-25%). Your 3-bet range can widen accordingly, including TT+, AJs+, KQo+, and some Ax suited hands, small suited connectors (e.g., 67s) as bluffs.

• BTN Open: BTN opens with the widest range (about 30%-40%). You can 3-bet with an even wider range, including many small/medium pairs, suited connectors, and Ax small hands.

• Blinds: Especially the big blind, when facing an open, you can consider 3-betting or flatting. Since you’re in the worst position, it’s often recommended to use a linear range (only 3-bet for value with QQ+, AK) or a mixed strategy balancing strong hands and some bluffs. But overall frequency should not be too high.

Sizing for a 3-Bet

The size of a 3-bet should adjust based on stack depth and opponent tendencies. Typically, a standard 3-bet is 3-4 times the open size. For example:

• If open is 3BB, 3-bet to 9-12BB.
• If open is 4BB, 3-bet to 12-16BB.
• From the blinds, due to positional disadvantage, you often need to go larger, e.g., 3.5-4.5 times.
• Deeper stacks (>150BB): you can increase size slightly to prepare for a 4-bet.
• Shorter stacks (<40BB): sometimes you can just shove all-in.

Practical Examples

Suppose you hold A♠K♠ on the button, and CO opens to 3BB, blinds 1/2. Effective stacks 100BB.

• Value 3-Bet: AK is strong and has a big advantage over CO’s opening range. You 3-bet to 9BB. If villain folds, you win 4.5BB; if they call, you have position postflop.

• Bluff 3-Bet: Suppose you hold 6♦7♦ on the button, CO opens to 3BB. Although not a strong hand, it has good postflop playability and helps balance your range. You 3-bet to 9BB, hoping opponent folds. If they call, you may have a straight or flush draw postflop.

Note: Bluff 3-bets should be chosen carefully against opponents. Against calling stations, reduce bluffing frequency.

Response and Adjustments

When you are the original raiser and face a 3-bet, your options include: fold, call, or 4-bet (a re-raise on the 3-bet).

• Fold: When your hand is weak or the opponent’s 3-bet range is tight.
• Call: When your hand has decent strength and playability, or you want to trap. Remember, after calling, you face a larger pot and a stronger opponent range.
• 4-Bet: With your strongest hands (like AA, KK) or some bluff hands (like A5s) to force folds or build a big pot.

Common Mistakes

1. Only 3-betting with strong hands: An overly tight 3-bet range is exploitable. Opponents will know you only have big hands, so they can easily fold when you 3-bet or exploit your flat calls with wide ranges.
2. Blindly 3-betting without considering position: Frequent 3-betting out of position leads to awkward postflop situations, especially when your hand isn’t strong.
3. Improper 3-bet sizing: Too large scares off opponents; too small gives them good pot odds to call.
4. Ignoring opponent tendencies: Against a calling station who rarely folds, frequent bluff 3-bets are ineffective. Conversely, against a tight-passive player with high fold equity, you can try more bluff 3-bets.

Summary

3-Bet is one of the most important preflop actions in poker. It not only extracts value from strong hands but also uses bluffs to force opponents to fold. The key to mastering 3-Bet lies in: adjusting your range based on position and opponents, choosing the right sizing, selecting bluff hands using blockers, and balancing value and bluff combinations. In practice, by continuously observing opponents and executing your own strategy, you will gradually improve your preflop profitability.