What is Heads-Up in Poker?

Heads-up poker is a two-player form of No-Limit Hold'em where the dealer button posts the small blind and acts first preflop, while the big blind is the other player. This structure means the button has position on every postflop street, making position even more valuable than in full-ring games. Heads-up is not simply a shorter-handed version of 6-max; it demands a distinct approach because hand ranges are much wider and aggression is more critical.

What heads-up is and is not

Heads-up is a game of aggression, position, and adaptation. It is not a game where you wait for premium hands; you must defend your blinds with a wide range and attack your opponent's weakness. It is also not a game where you can rely on a tight, passive style—you will get run over. Heads-up is the purest form of poker in terms of one-on-one combat, but it is also the most volatile and mentally demanding.

How this rule shows up

In heads-up, the button posts the small blind (usually half the big blind) and acts first preflop. The big blind acts last preflop but is out of position on every postflop street. This creates a dynamic where the button has a positional advantage, but the big blind has the option to check or raise after the button's action.

Here is a typical heads-up blind structure (example):

This structure means that the button should open-raise with a very wide range—often over 80% of hands in a typical cash game—because they have position and the big blind is only defending with a slightly wider range. The big blind must defend aggressively to avoid being exploited, but must also be careful not to over-fold to three-bets.

How much to raise and defend

A common heads-up opening raise size is 2 to 2.5 big blinds from the button. This is smaller than in full-ring because the blinds are closer and you want to see more flops with your wide range. Against a button raise, the big blind should defend with a wide range—often around a typical fraction of hands—by calling or three-betting. Three-betting is a key weapon; you should three-bet with a mix of strong hands and bluffs to keep your opponent honest.

Here is a qualitative guide to heads-up ranges (example, not solver output):

Worked example with blinds

You are playing heads-up with blinds 50/100. You are on the button with 7♠ 6♠. You raise to 200. The big blind calls. The flop comes 9♣ 8♦ 2♥. You have an open-ended straight draw. You bet 250 into a pot of 400. Your opponent calls. The turn is a 5♠, giving you a straight. You bet 600 into a pot of 900. Your opponent raises to 1,500. You have a strong hand, but your opponent's raise could mean a set or a higher straight. You decide to call. The river is a 3♦. Your opponent bets 2,000. You call and win against a pair of nines. This example shows how you must be willing to play marginal hands and continue aggressively with draws and made hands.

Counter-example with chips

You are on the big blind with A♠ 2♣. The button raises to 200. You call. The flop is K♦ 9♣ 3♥. You check. Your opponent bets 250. You fold. This is a standard fold because your ace-high is unlikely to be best, and you have no draw. Folding here is correct, even though you defended preflop. In heads-up, you cannot call down with every weak pair or ace-high; you must pick your spots.

When not to use heads-up strategy

Heads-up strategy is not applicable in full-ring or 6-max games. In those games, ranges are tighter, position is relative, and you cannot open as wide. Also, heads-up strategy assumes you are playing a skilled opponent; against a very weak player, you can simplify and play a more straightforward value-heavy game. Do not use heads-up aggression in multiway pots—it will cost you chips.

The next decision after a raise

When you are heads-up and you raise preflop, the next decision is how to react to a three-bet. If your opponent three-bets, you must decide whether to call, four-bet, or fold. This decision depends on your hand strength, your opponent's tendencies, and stack sizes. If you call, you will be out of position postflop, so you must be selective. If you four-bet, you are committing a large portion of your stack, so you need a strong hand or a good bluff.

Leaks on this rule

• Playing too tight preflop: In heads-up, you must defend your big blind with a wide range. If you fold too often, your opponent will exploit you by raising every button.
• Over-folding to three-bets: You need to defend against three-bets by calling or four-betting with a balanced range. If you fold too much, your opponent will three-bet you relentlessly.
• Being passive postflop: Heads-up requires aggression. If you check-call too often, you give your opponent the initiative and lose value. You should bet and raise more frequently than in multiway pots.
• Not adjusting to your opponent: Heads-up is a game of adaptation. If you play the same strategy against everyone, you will be exploited. You must adjust to your opponent's tendencies, such as folding too much or calling too much.
• Ignoring position: The button has a huge advantage. If you do not use that advantage by opening wide and applying pressure, you are giving up equity.

Frequently asked questions

Is heads-up poker harder than full-ring?

Yes, heads-up is generally considered harder because it requires a wider range of skills, including aggression, adaptation, and mental stamina. You must play many more hands and make decisions with weaker holdings.

What is the best strategy for heads-up poker?

The best strategy is to be aggressive, especially in position, and to defend your blinds widely. You should also adapt to your opponent's tendencies and use a balanced mix of value bets and bluffs.

How many hands should I play in heads-up?

You should play a very high percentage of hands from the button—often over 80%—and defend your big blind with a wide range, around a typical fraction. The exact numbers depend on your opponent and stack sizes.

Can I win at heads-up with a tight strategy?

No, a tight strategy will not work in heads-up because you will be blinded out and your opponent will steal your blinds relentlessly. You must be willing to play marginal hands and apply pressure.