Ante Post Betting Glossary: 40+ Terms Defined

Horse racing has its own language, and ante-post betting adds another layer on top. Whether you are placing your first advance wager or trying to decode a tipster’s column, this glossary covers the terms you will encounter most often. Definitions are kept practical and specific to the British context — the market that generates £766.7 million in remote horse racing GGY annually and supports the sport through a Levy system that reached a record £108.9 million in 2024-25.

A–D

Ante-post. A bet placed before the final declaration stage for a race. In British jump racing, final declarations are made by 10am the day before the race. On the flat, 10am two days before. Any bet placed before these deadlines is classified as ante-post and is subject to specific rules, most notably that non-runners result in a lost stake.

Accumulator. A bet combining two or more selections, where the winnings from each leg roll onto the next. In ante-post, if one leg becomes a non-runner, the accumulator downgrades — a treble becomes a double, a double becomes a single.

Back bet. A bet placed in favour of a horse winning. On a betting exchange, this is the counterpart to a lay bet. On a bookmaker site, all standard bets are back bets.

Balloted out. When a horse is removed from a race by the organisers because the field exceeds the maximum number of runners. Ante-post bets on balloted-out horses are void — the stake is returned.

Betting exchange. A platform where punters bet against each other rather than against a bookmaker. Betfair and Smarkets are the main UK exchanges. Ante-post non-runners on exchanges are typically voided rather than settled as losers.

Betting Levy. The Horserace Betting Levy — a statutory charge of 10% on bookmakers’ gross profit from British horse racing, collected by the HBLB and distributed to fund prize money, integrity, and research.

Commission. The fee charged by a betting exchange on winning bets. Smarkets charges 2%; Betfair’s standard rate is 5%, though it varies by customer.

Cash out. An early settlement option offered by some bookmakers, allowing you to close an ante-post bet before the race is run at a price reflecting the current market.

Declarations. The formal confirmation that a horse will run in a specific race. Final declarations are the deadline after which a withdrawal makes the horse a non-runner rather than a simple entry removal.

Drifter. A horse whose odds are lengthening — it is being backed less than other runners, or is being laid on an exchange. The opposite of a steamer.

E–L

Each way. A bet split into two equal parts: one on the horse to win, one on the horse to place (finish in the top two, three, or more depending on the race and terms). Place odds are typically one-quarter or one-fifth of the win odds.

Entries. The list of horses registered for a race. Entries are published at set stages — the initial entry, the five-day entry, and the final declaration. Ante-post markets are priced based on entries, and changes at each stage move the odds.

Final declarations. The last stage at which a trainer must confirm a horse will run. For NH: 10am the day before. For Flat: 10am two days before. Bets placed after this stage are not ante-post.

Form guide. A record of a horse’s previous race results, distances, going conditions, finishing positions, and weights carried. The primary research tool for ante-post analysis.

Futures betting. The American term for ante-post betting. Functionally identical, though the specific rules around non-runners and deductions vary between UK and US markets.

Going. The condition of the racecourse surface. The British going scale runs: hard, firm, good to firm, good, good to soft, soft, heavy. Going affects horse performance significantly and is a key variable in ante-post analysis.

Green-up. On a betting exchange, the process of laying a previously backed horse (or vice versa) to guarantee a profit regardless of the race outcome. A core strategy for ante-post exchange bettors.

Gross Gambling Yield (GGY). The total amount retained by betting operators after paying out winnings. British remote horse racing GGY was £766.7 million in 2024-25.

Hedging. Reducing exposure on an existing bet by placing an opposing wager. In ante-post, typically achieved through a lay bet on an exchange after the horse’s price has shortened.

Lay bet. A bet against a horse winning, placed on a betting exchange. You take the role of the bookmaker. If the horse loses, you win the backer’s stake minus commission. If it wins, you pay out at the agreed odds.

Liability. The maximum amount you could lose on a lay bet. Calculated as (odds – 1) x stake. Managing liability is essential for exchange-based ante-post hedging.

M–R

Margin (overround). The bookmaker’s built-in profit on a market. Calculated by converting all odds in a race to implied probabilities and summing them — the amount above 100% is the margin. Ante-post markets typically carry higher margins than day-of-race markets.

Market mover. A horse whose price changes significantly. A steamer shortens; a drifter lengthens. Market movers in ante-post reflect new information — trial results, trainer quotes, injury news — and are a key signal for informed bettors.

Matched volume. On a betting exchange, the total amount of money matched between backers and layers in a given market. Higher matched volume indicates a more liquid, more efficiently priced market.

Non-runner. A horse that was expected to run but does not start the race. In ante-post markets, non-runners result in lost stakes (bookmakers) or voided bets (exchanges).

NRNB (Non-Runner No Bet). A promotional concession offered by bookmakers that voids the bet and returns the stake if the horse does not run. Typically available on championship races at major festivals in the weeks before the event.

NRMB (Non-Runner Money Back). Functionally identical to NRNB. Different operators use different terminology.

Outright betting. A synonym for ante-post or futures betting, commonly used on European-facing platforms.

Place terms. The conditions determining which finishing positions qualify for a place payout in each-way betting. Standard terms vary by field size and race type; some bookmakers offer enhanced places on ante-post markets.

Reduction factor. On a betting exchange, the percentage by which winning bet payouts are reduced when a runner is withdrawn after bets have been matched. Does not apply to ante-post exchange bets.

Rule 4. Tattersalls Rule 4(c) — a deduction applied to winning bets when a horse is withdrawn after the market has formed. The deduction amount depends on the withdrawn horse’s price. Ante-post bets are exempt from Rule 4.

S–Z

Starting price (SP). The official odds on a horse at the moment the race begins. SP is determined by on-course bookmakers or, in the case of exchanges, by the Betfair Starting Price algorithm. Ante-post odds are fixed at the time of the bet and are unaffected by SP.

Steamer. A horse whose odds are shortening — it is being backed heavily, suggesting market confidence. Steamers in ante-post markets often reflect trial results or insider intelligence.

Supplementary entry. A late entry into a race at additional cost. Supplementary entries can reshape ante-post markets — particularly for Classics and championship races — by introducing a high-class contender that was not in the original field.

Tattersalls. The Tattersalls Committee, which oversees betting rules and resolves disputes in British horse racing. Tattersalls Rules govern the settlement of ante-post bets, Rule 4 deductions, and void-race procedures.

Tied-up capital. Money committed to an ante-post bet that cannot be used for other wagers until the race is settled. A key consideration in bankroll management — ante-post bets freeze capital for weeks or months.

Trial race. A preparatory race run before a major event that provides form evidence for ante-post markets. Examples include the Dante (Derby trial), the Cotswold Chase (Gold Cup trial), and the Cleeve Hurdle (Stayers’ Hurdle trial).

Turnover. The total amount staked by bettors. Distinct from GGY, which measures what operators retain. British racing turnover has declined by over 10% since 2023.

UKGC. United Kingdom Gambling Commission — the regulator of all commercial gambling in Great Britain. UKGC licensing is the baseline requirement for any operator offering ante-post betting to UK customers.

Value bet. A bet where the odds offered exceed the true probability of the outcome. Identifying value is the central skill in profitable ante-post betting.

Void. A bet that is cancelled, with the stake returned. Ante-post bets may be voided if a race is abandoned, relocated, or if a horse is balloted out. On exchanges, non-runners in ante-post markets are voided.

Weight. The amount a horse carries during a race, including the jockey and saddle. In handicap races, weight is assigned based on the horse’s official rating. Lighter weight is generally an advantage, and weight allocations influence ante-post assessments of handicap contenders.