Best Odds Guaranteed explained

Best Odds Guaranteed (BOG) is a horse-racing promotion offered by many UK bookmakers: if you take an early price and the horse's starting price (SP) turns out to be bigger, you're paid out at the better starting price instead of the price you actually took.

Key facts

• It only ever works in your favour on price. If the starting price is shorter than the price you took, you're still paid at the price you originally backed — BOG never pays out at a worse price than you agreed to.
• It specifically protects against a horse drifting, meaning its odds get bigger between when you bet and the race starting — without BOG, taking an early price always carries that specific risk.
• Not every bookmaker offers it, and terms vary. Some restrict BOG to UK and Irish racing only, and operators can differ on exactly when before the race BOG applies from — always check the specific operator's own terms.
• It's a bookmaker promotion, not a regulatory requirement. No UK licensing rule obliges an operator to offer Best Odds Guaranteed — where it exists, it's a product feature an operator chooses to provide.

Worked example

You back a horse at 4/1 well before the race. By the time the race starts, that horse has drifted out to 5/1 as the starting price. With BOG, your bet is settled at 5/1 — the better of the two prices — even though you only actually took 4/1 when you placed it. If instead the horse had shortened to 3/1 by the off, you'd still be paid at your original 4/1, not the shorter price.

Why bettors take early prices at all

Betting early, ahead of the final market, can offer value if you believe a horse is under-priced relative to how the market will move closer to the race. The trade-off is normally that the horse might drift instead, leaving you with a worse price than waiting would have got you. BOG removes that specific downside for markets where it applies, which is why it's particularly associated with backing fancied horses ahead of the final market.

Where it typically applies

BOG is a horse-racing concept, most commonly available on UK and Irish racing specifically, and usually only for bets placed on the day of the race rather than genuinely ante-post bets placed well in advance — see our ante-post betting guide for how that separate, longer-range bet type works. It's also specific to real racing — virtual horse racing has no live market to drift in the first place, since its result comes from a random number generator rather than an actual field of runners.

Common misconceptions

• "BOG guarantees I always get the best price available anywhere." It only compares your own taken price against that race's starting price with that specific bookmaker — it doesn't compare across different bookmakers.
• "BOG applies to every bet, on every sport." It's specifically a horse-racing feature, and even within racing it's usually restricted to certain race types, time windows and jurisdictions per the operator's own terms.
• "If BOG isn't mentioned, my early price is at risk for nothing." Without BOG, an early price simply carries the normal risk that the horse's price moves against you before the race — that's an accepted part of betting ahead of the market, not a defect.

Related content

See our guides to each-way betting and ante-post betting for other horse-racing-specific betting concepts, and Rule 4 deductions for what happens to your bet if a horse is withdrawn rather than simply drifting in price.