Dropping odds: why they fall and when they leave a sure bet
Dropping odds are prices a bookmaker cuts before or during a match: after team news such as an injury or the line-up, after a lot of money on one side, or because the wider market moved. Bookmakers don't all move at the same moment. While one has already cut its price and another still shows the old one, the two prices together can form a sure bet. The window lasts from seconds to a few minutes.
Market Movers
Live: the biggest drops right now
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| Match | Pick | Bookmaker | From → to | Drop |
|---|---|---|---|---|
| — | — | — | — | — |
Rising odds: the biggest rises right now
| Match | Pick | Bookmaker | From → to | Rise |
|---|---|---|---|---|
| — | — | — | — | — |
Market Movers: football, tennis and basketball, before the start, on the eight Greek-licensed bookmakers the scanner reads, in both directions. Each price is compared with the first one the scanner saw today (from 08:00 Athens time) and refreshed every minute. Drops of more than 60% and rises of more than 150% are left out as likely errors or suspended markets. A move is not a sure bet: the rest of this page explains the difference.
Why odds drop
A bookmaker's odds are its price for an outcome. It lowers that price when it thinks the outcome has become more likely, or when it wants less money on it:
- Team news. An injury, a suspension or the confirmed line-up changes the chances, and the odds follow, often in the last hour before kick-off.
- Money on one side. When many bets, or a few large ones, land on the same outcome, the bookmaker cuts its odds to limit what it could lose.
- The wider market. Large international bookmakers with low margins usually move first, and the rest copy them. That is what Greek bettors mean by «πτώση αποδόσεων στην Ασία»: a drop in the Asian handicap and goal-line markets that other bookmakers then follow.
- Live play. A goal, a red card or a break of serve moves in-play odds within seconds.
What a drop does to the other prices
Bookmakers build a margin into every market: the implied probabilities of all outcomes add up to a little more than 100%. When one outcome's odds fall, the others usually rise, so the margin stays about the same. A drop on Over 2.5 goals comes with a rise on Under 2.5; a drop on the home win comes with a rise on the draw and the away win.
This is where a sure bet can appear. The bookmaker that moved now offers a higher price on the other side, while a bookmaker that hasn't moved yet still offers the old, higher price on the side that dropped.
Rising odds: the other half of the move
Odds rise for the mirror reasons. Most rises are the other side of a cut: when a bookmaker lowers the home win, the draw and the away win go up. The rest are moves of their own: news against a side, a price nobody is backing that the bookmaker lets drift, or a price boost.
For a sure bet, a rise matters as much as a drop. A bookmaker that raised a price while the others stood still is offering more than the market, which is exactly where a sure bet forms: the higher back price against a lay price that hasn't moved. It lasts until that bookmaker follows the market back down. That is why the board at the top of this page, Market Movers, shows both directions: it is a record of the day's biggest moves on the Greek-licensed bookmakers, not a list of tips.
Worked example: a drop that leaves a sure bet
A football match, the Over/Under 2.5 goals market. The numbers are an example.
| Bookmaker | Over 2.5 | Under 2.5 |
|---|---|---|
| A, before the news | 2.00 | 1.85 |
| A, after the news | 1.80 | 2.05 |
| B, not moved yet | 2.00 | 1.85 |
Take the best price on each side: Over at 2.00 with bookmaker B, and Under at 2.05 with bookmaker A.
| Step | Calculation | Result |
|---|---|---|
| 1/odds Over | 1 ÷ 2.00 | 0.5000 |
| 1/odds Under | 1 ÷ 2.05 | 0.4878 |
| Sum | 0.5000 + 0.4878 | 0.9878 < 1 ✓ |
| Profit % | (1 ÷ 0.9878) − 1 | ≈ 1.23% |
Splitting €100 of capital
→ Over at B: €50.62 @ 2.00 = return €101.24
→ Under at A: €49.38 @ 2.05 = return €101.23
Whatever the score, you get back about €101.23: a profit of about €1.23 on €100 of capital, provided both bets are placed at those odds. When bookmaker B catches up and cuts its Over price, the sure bet is gone. With a betting exchange, the cover can also be a lay of Over instead of a back of Under. The full method and the calculator work the same way for any market.
A drop on its own is not a sure bet
Some bettors follow drops: they back the price that hasn't moved yet (Over at 2.00 with bookmaker B) and stop there. That is a value bet: if the drop was right, it wins more often than its odds suggest, but it can still lose. A sure bet covers every outcome, so the result doesn't matter; only the prices do.
The risks
- The second price moves first. Drops come in waves. Place the leg at the bookmaker that hasn't moved yet first, because that is the price about to change, then the cover.
- Obvious errors. A price far out of line with the market can be a palpable error, which the bookmaker may void.
- Account limits. Bookmakers notice accounts that keep betting old prices seconds after a drop. See how to avoid being limited.
- Live delays. In-play bets are accepted after a short delay, during which the odds can change or the bet can be refused.
How long the windows last
Each week the Greek Arbitrage Pulse publishes how many sure bets the scanner sees on the Greek-licensed bookmakers, how big they are when first seen and how long they stay open, live and before kick-off. Live windows are usually much shorter, because live odds move with every attack.
How ArbPlay helps
The table at the top of this page lists the biggest pre-match drops on the Greek-licensed bookmakers, free. The app goes one step further: it compares those bookmakers with betting exchanges and prediction markets, with sub-second updates, and shows the sure bets a move leaves behind: the two prices, the stakes for your capital and the profit after commission.
Frequently asked questions
Where can I see dropping odds live?
In the table at the top of this page: the biggest pre-match drops in football, tennis and basketball on the eight Greek-licensed bookmakers, each price compared with the first one the scanner saw today and refreshed every minute. It is free and needs no account.
What are dropping odds?
Odds that a bookmaker lowers before or during a match, because team news changed the chances, because a lot of money came in on one side, or because the wider market moved.
What are rising odds?
Odds that a bookmaker raises before a match. Most rises are the other side of a cut, because when one outcome's odds fall the others go up; the rest come from news against a side, a price nobody is backing, or a price boost. The Market Movers board at the top of this page lists the biggest rises of the day next to the biggest drops.
Why do odds drop before a match?
Most often because of team news (injuries, suspensions, the confirmed line-up), or because heavy betting on one outcome makes the bookmaker cut its price to limit its risk. Many bookmakers also copy the moves of the biggest low-margin bookmakers.
Are dropping odds a sure bet?
No. A drop on its own only shows that the market changed its mind; betting on it is a value bet, and it can lose. A sure bet exists only when the best prices at different bookmakers cover every outcome for less than 100% in total, for example while one bookmaker has moved and another hasn't.
What does “dropping odds in Asia” mean?
Drops in the Asian handicap and goal-line markets of the large Asian bookmakers, which take big bets at low margins and often move first. Other bookmakers, Greek ones included, often follow within minutes; until they do, their older price can be part of a sure bet.
Related: What is arbitrage betting · How to calculate a sure bet · Greek Arbitrage Pulse · all guides.