Bet Sharp: Read a Price, Then Measure Its Closing Line Value
A sharp price can be tested. Take the margin out, compare what you took with the close, and see how books cap stakes.
In betting, "sharp" describes a price and the bettor who takes it, not a run of wins. MadMarket's glossary has a sharp player reading news, lines and match analysis to bet with limited risk; its guide says a sharp book's odds are usually highly efficient and close to the true probability. A sharp price is tested two ways: take the margin out, and compare the price you took with the closing price (closing line value). Books also cap stakes, which is a separate matter. Orbit Exchange presents itself as a back and lay exchange where users match bets with each other, so the same tests apply to the prices you see. Below, the sums and a calculator.
What is sharp betting, and what is it not?
Most pages on sharp betting tell you who is sharp. A price is easier to judge than a person, and it can be tested the same afternoon.
Start with the people, since the word comes from them. MadMarket's glossary says "Sharp players read the news, the lines, and game analyses to place bets with limited risk, often across different sportsbooks." Its entry for a wise guy is a second name for the same bettor, one "who seeks value and does research before betting". The opposite is a square, which the glossary defines as "A casual or recreational bettor. Someone who is not a sharp or professional player."
Notice what is missing from those definitions. Nobody mentions a win rate. A month proves little.
Books get the same label. MadMarket's guide to value says the odds of a sharp bookmaker are "usually highly efficient and close to the true probability of an outcome", and that its pricing "can act as a strong benchmark for fair odds". A soft book, in the same guide, is aimed at recreational bettors, and "Their markets are often less efficient". AsianConnect writes that gaps between prices are common "especially across sharp vs soft bookmakers". So the word describes how closely a price follows the true chance, and the rest of this page is about how you check that for yourself rather than taking a label on trust.
One trap in the names. Sharp Exchange is the name of a product, offered by BetInAsia and by MadMarket. It is not a type of book.
I would not call anyone sharp on a good month. I would call a price sharp when it survives the two tests below. Stake caps are a separate matter, covered further down.
Take the margin out first
A price carries a built-in charge. Remove it before comparing anything.
The implied probability of a decimal price is 1 ÷ odds. Add the implied probabilities of every outcome in a market and the total comes out above 100%. Pinnacle's calculator page writes that the amount by which the market percentage rises above 100% "is the size of the margin the bookmaker holds over the bettor". Sportmarket's article on Asian handicaps gives the same sum for two sides: "Add the implied probabilities of both sides (1 divided by each price) and the amount above 100 percent is the margin."
To see a price without that margin, Pinnacle's short guide gives a proportional method: "divide the implied probability of the odds by the overall book percentage and multiply by 100". MadMarket's glossary puts the order of work plainly: "To find the "true odds" of an event, you must first remove the vig." That is one method among several, and it is the one the calculator below uses.
A two-way market at 2.06 and 1.88
Suppose the closing prices are 2.06 for one side and 1.88 for the other. Implied probabilities: 48.54% and 53.19%, a total of 101.74% (rounded), so the margin is 1.74%. Divide the unrounded 48.54 by 101.74 and you get about 47.72%, which is a margin-free price of 2.096.
A bettor who skips this step is comparing against a closing price that still carries the margin. Margin from decimal odds runs the same check on any set of prices, in any odds format.
Closing line value, with the formula
Closing line value compares the odds you take with the odds at the close.
Pinnacle writes that "The odds offered just before a game begins are called the closing line". Its definition of closing line value (CLV) is a comparison of "how the odds you bet on compare to the final odds" just before an event starts. AsianConnect's article says it compares the odds you take when placing a bet with the odds available at market close, which it names as kickoff or event start.
For decimal odds, Pinnacle gives the formula as "(X-Y) / Y * 100, where: X= decimal odds taken Y= decimal odds at the closing line". Read the result as a percentage. Pinnacle's description of the sign: "positive CLV means you secured a better line than the closing odds", and "negative CLV means you bet at worse odds than what was available at closing".
Take 2.16 against a close of 2.06. (2.16 - 2.06) ÷ 2.06 × 100 is +4.85%. Take 1.96 against the same close and the result is -4.85%. The chart below runs four hypothetical prices against that close.
Hypothetical. (Odds taken − closing odds) ÷ closing odds × 100. A price of 1.96 would give −4.85%.
Show the data table
| Odds taken | Closing line value |
|---|---|
| Took 2.32 | +12.62% |
| Took 2.24 | +8.74% |
| Took 2.16 | +4.85% |
| Took 2.06 | 0.00% |
What the number leaves out
Pinnacle states that beating the closing line does not, on its own, mean an individual bet will be profitable. In another article it writes "CLV does not always correlate with EV." The same article adds that people who "predominantly bet on props markets, derivatives or more obscure markets might not get too much Closing Line Value".
AsianConnect says the measure is most meaningful in markets with high liquidity, low margin and influence from sharp bettors. For a record worth reading it suggests at least 50 to 100 bets, specific markets or leagues, comparable price sources and consistent stake sizes. Fewer bets than that, and one lucky week can pass for a method.
What a positive number does not tell you
A positive closing line value says you took a better price than the close. It does not make any one bet a winner, and most bettors still end behind. It is a measure of price, not a promise of profit.
The close on an exchange
Pinnacle defines the closing line from the odds a bookmaker offers. On an exchange you have to decide what counts as the close, the last matched price or the best price on offer just before the market suspends, and apply the same rule to every bet. Orbit's exchange rules say the exchange "reserves the right to suspend any market at any time at its sole discretion", so decide your own rule for the close in advance. How much a price can take matters here too, since a price that exists for £5 is a thin guide to the close.
One Pinnacle article suggests documenting bets in a spreadsheet. That works. Log five things for every bet:
- The market and the selection.
- The odds you took.
- The closing odds you chose, by the rule above.
- The closing odds of the other side, to take the margin out.
- Your stake.
Run your own numbers
The calculator below works out the closing line value and the margin. It opens on the numbers from this page, so the first result should match the example above.
Closing line value calculator
Enter the odds you took and the closing odds. Add the other side to take the margin out.
Positive: you took a better price than the closing price. Negative: a worse one. Zero: the same.
Taking the margin out proportionally is one method; others exist.
Closing odds are whatever price you decide counts as the close; use the same rule for every bet you log.
Example shown. Replace the odds with your own.
The last row applies the same formula to the margin-free close (2.16 against 2.096 gives +3.07%); it is the site's arithmetic, not a rule from the sources. This explains how to measure a price. It does not tell you which bets to place.
What are considered sharp sportsbooks, and by whom?
The label belongs to whoever uses it, so here it is attributed each time. MadMarket's calculator for expected value tells you to estimate a probability by checking "Sharp" bookmaker prices and removing the margin. Pinnacle's thesis is that "The closing line should be the most efficient point of the market, and therefore the most accurate representation of underlying probability". That is Pinnacle's thesis about the closing line, and the same company states elsewhere, as quoted above, that CLV and expected value do not always agree. AsianConnect adds a caution of its own: "Big, suspicious bets can draw attention even on sharp books."
Separately from the label, the matrix lists two books reachable through the four brokers. Pinnacle opens through PS3838 at AsianConnect, BetInAsia and Sportmarket, and through Probet42 at MadMarket; the Pinnacle route has the detail. SBOBet opens through BLACK at BetInAsia, Edge at MadMarket and through Sportmarket; the SBOBet route covers it.
This page does not rank books and gives no margin for any of them. If you want to know whether a price is sharp, you have the margin and the closing line, and they work on any price you can see.
How books cap stakes
Sportmarket defines the limit in one line: "A betting limit is simply the maximum amount you can stake on a specific market at a given moment." It describes three forms, a limit on the stake, a limit on the market and a limit at a price level. It also writes that at a broker "many limits are market-based and apply regardless of whether a user has won or lost".
Pinnacle writes about other books: "at recreational sportsbooks, consistently achieving CLV is a key factor in whether your account gets limited". That is Pinnacle's statement about recreational books, and this page does not apply it to any broker.
The brokers have their own paper. The terms of AsianConnect, BetInAsia and MadMarket each reserve a right to refuse bets, Sportmarket's terms say that bookmakers may accept or decline the whole or any part of a bet before they confirm it, and the terms of BetInAsia and MadMarket add the rights to restrict, cancel or limit a wager and to adjust limits on individual accounts. Who caps a stake sets those clauses beside each broker's own welcome to winners, and the limits that apply on Orbit Exchange covers the exchange side.
Two kinds of limit
A limit that comes with the market is not the same as a limit on your account. The first belongs to the book; the second can rest on a clause in a broker's terms. Read which one you are looking at.
Nothing here is a way round a limit.
And on an exchange?
On an exchange the price is set by the bets users place against each other. A bookmaker builds a margin into its prices; on Orbit Exchange the charge is a commission, and Orbit's betslip message reads "A commission is charged on net profit from each market". The commission page has the sums, and no rate is written here.
Orbit's exchange rules matter to anyone logging closing prices. Where the market information or the sports rules do not say otherwise, markets are settled "on the official result of the relevant governing body regardless of any subsequent disqualification or amendment to the result", with an exception for an error in the reported result corrected within 24 hours. In most soccer markets, goals, penalties and red cards are Material Events, "meaning that markets should suspend and unmatched bets cancel when they occur to protect customers". For markets scheduled to be turned in-play, there is an option called Keep: "a customer can request that an unmatched Exchange bet should not be cancelled when the market is turned in-play". The suspension and Keep rules change what the last price on screen means, which is a reason to write down your rule for the close before you place the bet.
This page does not call the prices on Orbit Exchange sharp. It gives you the tests, and you apply them to what you see.
Judge a price by its margin and closing line
You log the odds taken, the close you chose and the other side.
- The record is about prices, not about how the last few bets ended.
- It asks for a consistent rule for the close.
- It needs the other side of the market, to take the margin out.
Best for: a bettor who records prices taken and the margin on markets where AsianConnect says CLV is most meaningful, such as liquid, low-margin ones.
Not ideal if: you bet mostly on props or obscure markets, where Pinnacle says CLV may be small.
Judge it by your results alone
You count wins and losses and nothing else.
- It needs no second price.
- A short run can look like a method, in either direction.
Best for: a bettor who stakes small and does not want a log.
Not ideal if: you want to know whether a price was good before the result arrives.
Where to go next
Break-even and variance sit on the pro betting roadmap. When the prices on two sides add up to under 100%, two sides that add up to under 100% is the next question, and where a price comes from is the one after it. What a venue charges before any of that counts is on the page on counting the cost, and testing a rule on past prices comes after that. For the door itself, the way into Orbit Exchange explains which brokers open it.