A price boost only has a usable edge when the boosted back bet and a matching exchange lay still pay enough after commission. The number on an offer card is based on the lay price when it was checked. It is not a live quote.
What makes a boost different?
A standard qualifying bet often costs a little and earns a later reward. A price boost raises the back odds on one selection. If you can lay that same selection at a short enough price, the pair can finish ahead whichever side wins. There may be no second free bet to wait for. The value is in the price gap itself.
The catch is speed and availability. A bookmaker may cap your stake or make the boost available only to selected accounts. An exchange can move its price or have too little money available at the quoted lay odds. Treat the bookmaker offer, exchange market and both betslips as separate checks.
A fictional £10 boost
Suppose a bookmaker boosts a selection to 2.0. You back £10. The matching exchange market has enough liquidity to lay it at 1.75, with 2% commission on exchange winnings. Assume the event, selection and settlement rules match, and that the full lay is matched at 1.75.
The equalising lay stake is £10 × 2.0 ÷ (1.75 − 0.02) = £11.56 to the nearest penny. The exchange holds £11.56 × (1.75 − 1) = £8.67 liability. You need £10 at the bookmaker and £8.67 at the exchange before settlement.
| Result | Bookmaker | Exchange | Net |
|---|---|---|---|
| Back selection wins | £10 profit | £8.67 liability lost | £1.33 ahead |
| Back selection loses | £10 stake lost | £11.56 lay win less 2% commission = £11.33 | About £1.33 ahead |
The lay-win side is £11.3288 before rounding. Your exchange and bookmaker settle in pennies, so allow for a penny's difference between the sides. The example is for teaching, not a current selection or price.
Recalculate when the lay moves
Keep the £10 back bet at 2.0 but imagine the lay price has drifted from 1.75 to 2.10. At 2% commission, the balancing lay stake becomes £9.62 and the calculator shows about 58p down either way before penny-rounding. The rounded lay can move one side by a penny. The boost is still called a boost, but that pair no longer gives a positive result. If the lay is only partly matched, the unmatched part of the back bet is exposed to the sports outcome.
Open the price-boost calculator with the fictional £10 stake and enter 2.0 and 1.75 to reproduce the first pair. Then change the lay odds to 2.10. This practice does not require a real account or bet.
Check the offer and the market
- Offer: is the enhanced price available to your account, for your stake, before the cut-off?
- Market: are the event, selection and settlement rules the same on both sides?
- Price: can you actually get the boosted back odds and the current lay odds for the full stake?
- Balance: can your exchange account cover the liability without using money you need elsewhere?
- Result: do both outcomes remain acceptable after commission and rounding?
Use the current price-boost feed to find a candidate, then check the bookmaker's live offer and recalculate with the exchange price you can actually match. If one side moves or the market rules differ, stop and assess the new position before placing anything.
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