Betting Glossary: Sharp Betting Terms Explained

Betting on price rather than picks comes with its own vocabulary. Sharp books, no-vig odds, CLV, steam: if you've read our guides or used the Terminal, you'll have seen all of them. This glossary explains each one in plain English, with a quick example where it helps, and points you to the guide that covers it in depth.

All odds are shown in decimal format.

Bookmakers

Sharp bookmaker

A bookmaker that sets its prices mainly from the bets of professional, winning players. Sharp books like Pinnacle, SingBet and Circa run on thin margins, accept large stakes and don't limit winners, so their odds absorb what the best bettors in the world think. That makes their prices the closest thing the market has to the true chance of an outcome, and the benchmark every value bettor measures against. See which books count as sharp on our bookmakers page.

Soft bookmaker

A bookmaker built around recreational customers, like Bet365, William Hill or Paddy Power. Soft books carry wider margins, restrict accounts that win, and often copy sharp prices rather than setting their own, usually a little later. That delay is where most value betting and dropping odds opportunities come from. Browse the full list of soft bookmakers OddsHub compares.

Betting exchange

A platform where bettors bet against each other rather than against a bookmaker, such as Betfair Exchange. You can back an outcome to happen or lay it not to happen, and the exchange takes a commission on winnings instead of building a margin into the odds. With enough money traded, exchange prices can be as sharp as the best bookmakers.

Max bet limit

The largest stake a bookmaker will accept on a market at a given time. Sharp books open markets with low limits while their price is still an estimate, then raise them as they grow more confident. A limit rising at the same time as the odds drop is one of the strongest signals in betting, which we cover in how bookmaker limit increases predict odds movement.

Account limiting (gubbing)

When a soft bookmaker cuts the maximum stake on an account, often to pennies, because the customer wins or bets in a way that looks sharp. In the UK it's widely called gubbing. It's the main practical cost of beating soft bookmakers, and the reason most value bettors spread their bets across several accounts.

Odds and pricing

Decimal odds

Odds shown as the total return for every 1 unit staked, including your stake. At 2.50, a £10 bet returns £25 if it wins: £15 profit plus your £10 back. Decimal odds are the easiest format to compare and calculate with, which is why every price on OddsHub uses them.

Implied probability

The chance of an outcome that a price suggests. Divide 1 by the decimal odds: 2.00 implies 50%, 4.00 implies 25%, 1.25 implies 80%. Comparing implied probability with your own estimate of the true chance is the starting point of every value bet.

Margin (overround, vig or juice)

The cut a bookmaker builds into its odds so it profits whichever side wins. You can see it by adding up the implied probability of every outcome. On a fair coin toss, both sides should be 2.00, which adds up to exactly 100%. A bookmaker offering 1.91 on each side implies 52.4% twice, a total of 104.7%, and that extra 4.7% is its margin. Overround, vig (short for vigorish) and juice all mean the same thing. Sharp books work on low margins of around 2 to 3% on major markets, while soft books usually charge much more.

The margin is also a measure of how sure a bookmaker is of its price. The less confident it is, the wider the margin it adds to protect itself. That's why margins are higher on lower leagues, player props and markets that have only just opened, and why they tighten towards kickoff as more information and money come in. A high margin on a sharp book is a sign the price is still an estimate.

No-vig odds (fair odds)

A bookmaker's odds with the margin taken out, leaving an estimate of the true price. Strip the margin from 1.91 and 1.91 and both sides come back to 2.00. No-vig odds from a sharp bookmaker are the line value bettors try to beat. Work them out for any market with our free no-vig odds calculator.

Favourite-longshot bias

The tendency for bookmakers to load more of their margin onto outsiders than favourites, because recreational bettors overpay for long shots. It's why removing the margin equally from every outcome slightly misprices both ends of a market, and why OddsHub uses the logarithmic method to calculate fair odds instead.

Value

Expected value (EV)

The average profit or loss a bet would make if you placed it many times. Multiply the true chance of winning by the odds, then subtract 1. A 50% chance at odds of 2.10 gives (0.50 × 2.10) − 1 = +5% EV, so every £10 staked is worth £0.50 on average. Positive EV (+EV) means the bet is worth taking; negative EV means the bookmaker is getting the better of the deal.

Value bet

A bet where the odds are higher than the true chance of the outcome justifies, in other words a +EV bet. Most value bettors find them by comparing soft bookmaker prices against a sharp bookmaker's no-vig odds. Our guide to value betting explains the method, and the free value bets page lists them for you.

Edge

Your advantage over the bookmaker on a bet, usually expressed as the EV percentage. A 3% edge means that on average you expect to make 3% of your stake. Small edges add up over volume: 3% means little over 20 bets and a lot over 2,000.

Variance

The natural swings in results around what your edge predicts. Even +EV bets lose often, and a good bettor can be down after hundreds of bets through bad luck alone. It's why short-term results are a poor guide to skill, and why serious bettors judge themselves on closing line value instead.

Market movement

Opening line

The first price a bookmaker puts up on a market. Opening lines are set with the least information and the lowest limits, so they're the most likely to be wrong, and the most likely to move once sharp money arrives.

Closing line

The final price available just before an event starts. By then every piece of team news and every sharp bet has had a chance to move it, which makes a sharp bookmaker's closing line the most accurate price a market produces. OddsHub shows Pinnacle's closing odds for free; see Pinnacle closing odds, and where to find them.

Closing line value (CLV)

How the odds you took compare with the closing line. Take 2.00 on a team that closes at 1.70 and you beat the close by 17.7%. Consistently beating the closing line is the best evidence that a bettor has a real edge. Read our full guide to closing line value, or check any bet with the CLV calculator.

Dropping odds

Prices that fall sharply from where they opened, usually because informed money has come in. When a sharp bookmaker drops its price, soft bookmakers often take seconds or minutes to follow, and the gap between them is the opportunity behind the dropping odds strategy. See today's biggest moves on the free dropping odds page.

Steam move

A sudden, sharp price move that sweeps across many bookmakers at once, usually triggered by a large wave of informed money. Steam moves fade fast, so the value goes to whoever spots the first bookmaker to move and bets at the ones that haven't caught up yet.

Line shopping

Comparing the price on the same bet across several bookmakers and taking the best one. It's the simplest edge in betting: taking 2.10 instead of 2.00 on the same outcome is worth 5% on every bet, before you've made a single prediction. OddsHub compares odds across 490+ bookmakers for free.

Markets

Moneyline (ML)

A bet on who wins the match, shown as ML on OddsHub and in the Terminal. In sports without draws it's a two-way market. In football, the three-way version (home, draw, away) is usually called the match result or 1X2.

Asian handicap

A market that gives one team a head start or deficit in goals, removing the draw. On a whole line like +1, the bet is refunded if the result lands exactly on it. Quarter lines like +0.75 split your stake in half across the two nearest lines, +0.5 and +1.0, so some results win or lose only half your stake. On +0.75, a one-goal defeat loses half and refunds the other half. Asian handicaps are among the sharpest, highest-limit markets in football.

Totals (over/under)

A bet on whether the total of something, usually goals or points, finishes over or under a line. Over 2.5 goals wins with three or more goals. Totals also exist for corners, cards and individual teams (team totals).

Player props

Bets on an individual player's performance rather than the match result, such as shots, points, assists or cards. Props are lower-limit markets that soft bookmakers often price loosely, which can make them a good source of value.

Put the vocabulary to work

Knowing the terms is the first step. Seeing them in action is the next. The OddsHub Terminal shows every drop from the sharp books with the no-vig fair price, the max bet limit and your own bookmakers' prices alongside, then tracks the EV and CLV of every bet you take. The free plan runs the full Terminal on a 15-minute delay, and every paid plan starts with a 7-day free trial.