Ante Post Betting Explained: Bigger Prices, the Risks and NRNB

Ante post betting means backing a horse before the final declarations for a race, and in practice that can be months before it is run. The big spring races, the Grand National and the championship races at Cheltenham, have markets open long before the day, and people back horses in them over the winter.

The appeal is the price. A horse that is 20/1 in November can be 6/1 by the morning of the race if things go its way. The risk is just as simple, and it is the part that catches people out: if the horse doesn’t make it to the race, the bet is usually lost.

What ante post betting is

The dividing line is the final declarations. Up to that point, a bet on a future race is ante-post and is struck on ante-post rules. After the declarations, a day or two before the race depending on the race, the market becomes a normal day-of-race market and the ordinary rules apply.

The difference between the two is the treatment of non-runners. On the day, a bet on a horse that doesn’t run is void and the stake comes back. Ante-post, the stake is normally lost if the horse doesn’t take part. That is sometimes described as “all in, run or not”: your horse is in the bet whatever happens to it.

There is a second, friendlier difference. Ante-post bets are not subject to Rule 4. If other horses are withdrawn before the race, your price stands in full, where a day-of-race bet might have a deduction taken off the winnings.

Why the prices are bigger

The early prices on a big race reflect a great deal of doubt. Nobody yet knows which horses will be fit, which race each trainer will choose, what the ground will be or how big the field will be. The market prices all of that in, and the result is longer odds than the same horse will carry once the doubts clear.

Take £5 on a horse at 20/1 months ahead, which is then backed into 6/1 by the day of the race. If it wins, the ante-post bet returns £105. The same stake at 6/1 on the day returns £35. That gap is the whole reason ante post betting exists.

But the gap is not free money. It is the payment for the risk that the horse doesn’t run at all. A horse can be injured, lose its form, be switched to a different race, or simply not be declared. Each of those turns an ante-post bet into a loser without the horse ever leaving the stable.

The real price of an ante-post bet

One way to think about an ante-post price is to allow for that risk directly. Suppose you take 20/1 and you reckon there is only an even chance the horse will line up. Half the time the bet is simply lost before the race. Over the long run, that is roughly like having a price of 19/2 on a horse that is sure to run, because the 21 you get back for a winner is only available half the time.

If you think there is an 80% chance it runs, the equivalent price is closer to 16/1 on a certain runner. Doing that sum before you bet is a sobering way to compare the ante-post price with what you might get closer to the day.

The numbers are only as good as your guess about the horse running, and nobody can know that for sure in November. The point is not precision. It is to stop the big price looking bigger than it really is.

How the ante-post market moves

An ante-post market is alive for months, and it moves in steps rather than minute by minute. The steps usually follow news. A horse wins a trial race and is cut in price. A trainer names the race it is being aimed at and the price shortens again. A setback, a disappointing run or a change of plan sends it the other way, sometimes out of the market altogether.

The ground is the slowest-moving factor and one of the biggest. A horse that needs soft ground can look a fine ante-post bet in a wet winter and a poor one after a dry spring, and nobody knows which it will be until the week of the race. That uncertainty is part of the price in November, and it is gone by the day.

It also explains why ante-post prices on the same horse can differ a lot between firms. Each bookmaker is guessing about an event months away, and they don’t always guess alike. Comparing prices matters more ante-post than on the day, because the gaps can be several points rather than a fraction.

What changes at the declarations

The declarations are the point at which trainers confirm which horses will run. Once the final field is known, the biggest ante-post risk, not knowing whether your horse will take part, is largely resolved for bets struck from then on.

Bets struck after that point are day-of-race bets. If the horse is withdrawn, the stake comes back, and a late withdrawal of another runner can bring a Rule 4 deduction. The prices are usually shorter than they were ante-post, because the doubt has gone out of the market.

That makes the declarations a natural moment to compare. The ante-post price you took, the price on the day and the starting price give three views of the same horse, and after a few seasons they show quite clearly whether your early bets are beating the market.

Non runner no bet

Non runner no bet, often shortened to NRNB, is an offer that removes the biggest risk. If your horse doesn’t run, the stake is returned instead of lost. Everything else about the bet stays the same: the price is fixed, and it still pays in full if the horse wins.

It is usually offered on the biggest races, and usually closer to the event, once the likely fields are clearer. Firms decide for themselves when to offer it and on which races. The prices under non runner no bet can be shorter than the straight ante-post prices, because the bookmaker has taken on the risk you would otherwise carry, and that risk has a cost.

It is worth comparing the two. A slightly shorter price with your stake protected can be a better bet than a bigger one with your stake exposed, especially on a horse whose target is not yet settled.

Best odds guaranteed and ante-post

Best odds guaranteed is a different offer, and it usually belongs to day-of-race betting. It pays you the starting price if that turns out bigger than the price you took. Ante-post bets normally sit outside it.

That makes sense once you see what an ante-post bet is. You are fixing a price early precisely because you expect it to shorten. If the horse drifts instead and goes off at a bigger price, the ante-post bet is paid at the price you took. That is the other side of the deal, and it is why an ante-post bet only makes sense on a horse you expect the market to come round to. The starting price page explains best odds guaranteed and the SP in more detail.

Ante-post each way

Each way ante-post is common on the big handicaps, where a horse at a long price can hit the frame in a big field. £5 each way on a horse taken at 25/1, which finishes third in a race paying 1/5 of the odds, returns £30 from the place part. Had the same horse been backed at an SP of 8/1 on the day, the place part would have returned £13.

Check the firm’s rules on place terms before relying on them. The places paid depend on the field that actually runs, which can be smaller than the one you expected months earlier, and some firms guarantee a number of places on the biggest races. How the standard terms are set is explained in the each way guide.

Ante-post doubles and trebles

Ante-post multiples are popular around the big festivals: a double on two championship races, or a treble across the meeting. £5 on a double at 10/1 and 8/1 returns £495 if both win. The price is attractive, and the risk is doubled with it, because each horse has to get to its race as well as win it. A multiple with one ante-post leg that fails to run is normally a losing bet, not a smaller one.

When ante post betting makes sense

Ante post betting suits a particular kind of view: a horse you rate highly whose target is already clear, from a yard that has said where it is going, in a race where the early market has not caught up. It suits guesses badly. If you are not sure the horse will run, you are paying for that doubt with your stake.

The practical habits follow from that. Back horses with a stated target, not ones whose plans are open. Prefer non runner no bet when it is offered at a fair price. Keep ante-post stakes small, because the money can sit in a bet for months with a real chance of being lost before the race. And remember that the horse that was 20/1 in November was 20/1 for a reason: the price you are pleased with is the market’s measure of how much could go wrong.

The festivals section covers the Grand National, Cheltenham and Royal Ascot, the meetings where most ante-post interest sits.