Up to £25,000 is available to current Unibet customers under the terms of the Best Odds Guaranteed - UK and Irish Horse Racing promotion. All you have to do is keep an eye on the bonus page and bet on the markets on offer at maximum quotes.
This bonus works as follows: on the day of the race, before 8:00am you place a bet on the horse at odds marked BOG of 6.00. The horse ended up winning, but as the pre-match line progressed, the odds on the horse also rose to 8.00. No problem - you'll be paid out at 8.00, so you won't be biting your elbows about missing out on earning opportunities!
The promotion allows you to bet on both single and acca bets. But no betting is allowed on ante-post, other markets other than winnings. You also cannot bet with guaranteed maximum quotes in in-play mode.