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Range advantage
Whose whole range does better on a given flop, why the preflop raiser often holds that edge, and how it shapes how often each player bets.
A reference page: an idea the course assumes, without practice or progress. Lessons link here the first time they use the term.
On this page
- Define range advantage as one whole range's equity against the other.
- Explain why the preflop raiser usually holds more high cards and big pairs.
- Predict which player a flop favours from the two preflop lines.
- Link range advantage to how often a player can bet.
Two ranges, one board
Range advantage compares whole ranges, not hands. Deal a flop and ask: if every hand in my range played every hand in yours to the river, how often would mine win? The answer is the range's equity, an average over every combo.
It is the first thing to read on any flop, because it tells you who can bet a lot of their hands and who should mostly check. It says nothing yet about the hand you are holding.
Why the raiser usually starts ahead
Take the ranges Rail uses for teaching: a button open against a big-blind call. The big blind would 3-bet AA, KK, QQ and AK, so none of them are in its calling range. That is 6 + 6 + 6 + 16 = 34 combos of the strongest starting hands that only the button can hold.
The big blind keeps more small pairs, suited connectors and weak suited hands. So boards with an ace or a king, and dry boards in general, favour the button. This is what players mean by "initiative": not a privilege earned by raising, but the shape two ranges have after the preflop betting.
Where the gap closes
Middling connected boards are where the caller catches up. On 8♥7♥6♣ the big blind's suited connectors and small pairs make straights, two pairs, sets and strong draws, while the button's big pairs are just one pair.
The caller is never far behind on boards like these, and on a few it is ahead. That is why a raiser who bets every flop by habit loses money on exactly these textures.
What the advantage tells you to do
The player who is ahead on the board can bet often, usually small. Most of the range is ahead or has enough equity to keep going, and a small bet is enough to make the weakest hands pay or fold.
The player who is behind checks more and defends with care. Betting first into the stronger range rarely pays, because the hands that continue are the ones that beat you.
Range equity
- Raiser · Under-the-gun open
- 53.4%
- Caller · Big-blind call against UTG
- 46.6%
In the top 10% of hands
- Raiser
- 32.2%
- Caller
- 20.4%
Illustrative ranges, written by hand for teaching — not solved.
Range advantage sets how often you bet. How big you bet depends on who holds more of the very strongest hands, which is nut advantage.
What it does not tell you
It is an average. A button range that is ahead on A♠8♦3♣ still holds plenty of hands that missed, and a big blind behind on average still has its sets. Range advantage frames the decision; where your hand sits in your range makes it.
And it moves. Every turn and river card shifts the balance, sometimes a lot, and the next card page measures how.
Rules of thumb
- High cards and dry boards favour the preflop raiser; middling connected boards bring the caller back.
- The tighter the opening range, the bigger its advantage on almost every flop.
- Range advantage tells you how often to bet, not how big.
When they break
- Against a caller who never 3-bets, the big pairs stay in the calling range and the raiser's edge on high boards shrinks.
- Multiway, every extra caller adds hands that hit the board, so the raiser's average edge counts for less.