ConceptsRanges and boards
Nut advantage
Who holds more of the very strongest hands on this board — which decides who can bet big.
What it is
Nut advantage asks a narrower question than range advantage: of all the hands that are near the top on this board, whose range holds more of them?
Rail measures it the same way everywhere: rank every two-card holding the board leaves by what it makes, take the strongest 10%, and count what share of each range is in that group.
Why it matters
Range advantage tells you how often to bet; nut advantage tells you how big. Big bets and overbets need the nuts behind them, because only a range with more very strong hands can put in a lot of money and still have value when called.
A player can have one without the other. The preflop raiser may be ahead on average but hold fewer sets and straights on a low connected board than a caller who defended all the suited connectors.
Check-raises come from nut advantage, too: the player with more strong hands in the region can raise big and have the hands to back it.
The maths
A range's nut share equals its combos among the strongest 10% of hands on this board, divided by all its combos.
Worked example
Two flops, two leaders
With the widget's illustrative ranges, look at the top 10% of hands on each board.
- Under-the-gun open against a big-blind call on A♠8♦3♣: about 35% of the opener's range is in the top 10%, against about 19% of the caller's. A big advantage at the top.
- Button open against a big-blind call on J♠T♠9♠: the button has about 48% range equity, and only about 18% of its range in the top 10% — the big blind has about 24%.
On A♠8♦3♣ the opener can bet big. On J♠T♠9♠ the caller has both advantages, and big bets from the opener run into the hands that beat them.
Try it
Compare the share of each range in the top 10% as you change board and matchup.
Common mistakes
- Overbetting because you are ahead on average, without the strong hands that make an overbet work.
- Assuming the caller never has the nuts. On low and connected boards they often have more of them.
- Counting only your own hand's strength rather than how many strong hands each range has.
Related concepts
- Range advantageOn a given board, whose whole range has more equity — which decides who can bet often.
- Bet sizing and polarisationSmall, big or overbet: every size has a job, and the job depends on the board and on which hands you bet.
- Check-raisingCheck, let them bet, then raise: the out-of-position player's strongest weapon.