Polarised vs linear ranges
A polarised range is strong hands and bluffs with little in between; a linear range is your best hands in order with no bluffs. Knowing which one you hold tells you how to size your bets.
Two players can bet the same flop for completely different reasons, and the shape of their range is the tell. One is polarised: nuts and air. The other is linear: good hands in order. The shape is not a label you slap on after the fact; it is the thing that should decide how much you bet. Get the shape right and the sizing falls out of it.
Two shapes a betting range can take
When you bet, the set of hands you would bet with has a shape. There are two archetypes worth knowing.
A polarised range is barbell-shaped: strong value hands on one end, bluffs on the other, and very little in the middle. A linear range, sometimes called merged or condensed, is a block taken from the top: your best hands down to some cutoff, with no bluffs included.
These are not just academic categories. They answer different questions. A polarised range asks "how do I get maximum value and maximum fold equity at the same time". A linear range asks "how do I get called by worse". The answers point to different bet sizes.
The polarised range: nuts and bluffs
Picture a river where your betting range is two sets and two missed flush draws. That is polarised: the sets are pure value, the missed draws are pure bluffs, and you hold nothing in between because your medium hands checked earlier.
A polarised range wants to bet big, often three-quarters of the pot or an overbet. Both halves agree on it. The value hands want the biggest pot they can win at showdown, and the bluffs want the most fold equity they can buy. A medium hand would hate a big bet, which is precisely why medium hands are not in this range; they checked. This is the engine behind overbets: they only make sense when the range betting them is polarised.
The linear range: everything good, in order
Now picture the opposite. You raised, the board is King-high, and you have a clear range advantage. You bet a flop with all your Kings, Aces, and big pairs, plus some second pairs. There are no bluffs in this set because you do not need them; you are simply ahead and want to get paid.
A linear range wants to bet small, around a third of the pot. The goal is to keep worse hands in. If you bet big with a range that is all value and no bluffs, the opponent folds everything except the few hands that beat you, and you win a small pot or lose a big one. Bet small and the second-best hands call, which is the entire point of value betting. The wide big blind defence is what makes these small value bets profitable: the caller arrives with enough weak hands to pay you off.
Why the shape decides your bet size
Here is the rule worth memorising: range shape decides bet size, not hand strength.
It feels backwards at first. You would think a strong hand always wants a big bet. But a strong hand inside a linear range bets small, because the range around it has no bluffs and a big bet would only fold out the customers. The same strong hand inside a polarised range bets big, because now it is paired with bluffs and the big size serves both.
So before you pick a size, ask what shape your range has on this street:
- Polarised (nuts and air) wants a large size.
- Linear (top hands, no air) wants a small size.
Decide the shape first, and the number is no longer a guess.
Sizing tells your opponent which shape you have. Bet big and you are claiming polarisation; bet small and you are claiming a condensed value range. Make sure the size you choose matches the range you actually hold.
Reading an opponent's range shape
The same lens reads opponents. When someone fires a large bet or an overbet, they are representing a polarised range: they have you crushed or they have nothing. That is what makes good bluff-catchers valuable, because you only need to beat the air half.
When someone bets small, they are usually representing a linear, condensed range: a lot of medium-strong value that does not mind being called. Raising into a small bet can be effective, because their range is capped at the top and has few hands that want to play a big pot. The same shape thinking drives 3-bet pot decisions, where lower stack depth pushes ranges toward polarisation faster.
Bottom line
A polarised range is strong hands and bluffs with an empty middle, and it bets big because both halves want the pressure. A linear range is your best hands top down with no air, and it bets small to get called by worse. These shapes are not theory-room labels; they are what the open-source DCFR solver behind this site converges on when it balances value against bluffs in a spot. The shape of your range, not the strength of one hand, is what sets the size: a monster bets small inside a value-only range and big inside a polarised one. Decide the shape first, let the size follow, and use the same read on opponents to know whether you are facing nuts-or-air or just a thin value bet. Pair this with bet sizing and the preflop charts and your bets start telling a coherent story.
Frequently asked questions
- What is a polarised range in poker?
- A range split into two extremes: strong value hands you are happy to stack off with, and bluffs with little or no showdown value. There are few medium hands in between. Polarised ranges bet large because the value half wants a big pot and the bluffs want maximum fold equity.
- What is a linear range?
- A linear or merged range is your strongest hands taken from the top down, with no bluffs included. It is used when you are value betting and want worse hands to call, so it bets small to keep the opponent in with second-best holdings.
- When should I use a polarised versus a linear range?
- Polarise when your medium hands prefer to check and the spot rewards big bets, often on later streets or in re-raised pots. Go linear when you have a range advantage and want thin value, betting small so weaker hands call. The board texture and street usually decide.
- Why does a polarised range bet bigger?
- Because both halves benefit. The value hands want to build the biggest pot they can win, and the bluffs want to apply the most pressure to force folds. A medium hand would not want either, which is exactly why medium hands are left out of a polarised betting range.