An ante-post horse-racing bet and a Non-Runner No Bet wager can carry the same horse, race and price-looking numbers while remaining different contracts. Under ordinary ante-post terms, your stake usually loses if the horse does not run. Under Non-Runner No Bet, often shortened to NRNB, the bookmaker returns the stake when the selection is a non-runner.
For matched betting, the useful question is not simply "Does this bookmaker offer NRNB?" It is "What were the settlement rules on each accepted bet at the moment I placed it?" Check the bookmaker receipt, the exchange market name and both rule sets before treating the two sides as a match.
The direct answer
Ordinary ante-post betting is commonly offered on an all in, run or not basis. Betfair's current Future Racing guidance says non-runners are losers unless otherwise specified.[1] Its Exchange rules similarly say that ante-post bets on an individual horse generally stand whether the horse runs or not.[3]
NRNB changes that non-runner result. Betfair Sportsbook says selected ante-post races become Non-Runner Money Back and that bets placed after a race becomes NRNB are refunded if the horse does not run.[1] The start point matters. A later NRNB label does not normally rewrite an older ante-post bet. In plain English, NRNB is not retrospective unless the accepted terms explicitly say it is.
The safe matched-betting rule is simple: record the status of both bets when accepted. Never infer it from what the race page says today.
Three contracts that look deceptively similar
| Contract | If your horse runs | If your horse is a non-runner | What to record |
|---|---|---|---|
| Bookmaker ante-post | Settles on the race result | Usually loses, subject to stated exceptions | Market label, price, each-way terms and timestamp |
| Bookmaker NRNB | Settles on the race result | Stake returned under the accepted promotion | NRNB wording, eligible market and when it began |
| Exchange ante-post | Back or lay settles on the result | Matched bets generally stand, subject to exchange exceptions | Exact market, matched amount, average odds and rules |
A day-of-race exchange market is a fourth contract. It should not be confused with the ante-post exchange market for the same race. Smarkets states that exposure is not combined between its ante-post and day-of-race markets, and commission is payable separately.[4] Two tabs carrying the same horse name do not become one position.
Bookmaker and exchange terminology can also differ. "Non-Runner No Bet", "Non-Runner Money Back" and "NRMB" may describe the refund feature, but only the accepted terms tell you which races, bet types and placement times qualify.
The placement-time test
Imagine a race page changes in three stages:
- Early ante-post: the field is not final and the market says bets stand whether the horse runs or not.
- NRNB window: the bookmaker expressly marks selected new bets as refundable for a non-runner.
- Day of race: declarations are known and a fresh market operates under its own non-runner rules.
Betfair's Sportsbook guidance currently describes Future Racing ceasing at the overnight declaration stage, with later bets moving to non-runner money-back rules. It also says selected races can receive NRNB earlier.[1] Treat that as an example of one operator's structure, not a universal clock. Another bookmaker can use a different start time, race list or wording.
Take a screenshot or save the terms before betting. The useful evidence includes the race and market name, selection, price, stake, placement time, promotion label and any limits on win, each-way, free-bet or cash stakes. A promotional banner without the accepted receipt is weak evidence if the market later changes.
The Gambling Commission says operators' rules must cover the circumstances in which bets will be void and how an event outcome is determined.[5] That is why the answer belongs in the published rules and market information, not in a forum recollection.
Match the exchange contract before you calculate
Suppose you back a horse with a bookmaker and lay the same horse on an exchange. There are three broad outcomes:
- The horse runs and wins. The bookmaker back wins and the exchange lay loses its liability.
- The horse runs and loses. The bookmaker back loses and the exchange lay wins.
- The horse does not run. Settlement now depends on the two contracts, not on the race result.
If both accepted sides are ordinary ante-post contracts, a non-runner can leave the bookmaker back as a loser while the exchange ante-post lay wins. If the bookmaker back was accepted under NRNB but the exchange lay was accepted in an ante-post market, the bookmaker can refund the stake while the exchange lay stands and wins. If both sides are genuine day-of-race non-runner markets, both may void, subject to the exact rules.
Those are different cash paths. A normal matched-betting calculator generally balances the "horse wins" and "horse loses" outcomes. It may not show a third non-runner path unless the chosen mode is designed for that promotion. Write all three outcomes down before placing either side.
Do not mix an ante-post lay with a day-of-race lay simply because the later price looks better. Smarkets explicitly keeps those markets and their exposures separate.[4] Check that the lay says "matched", record the accepted amount and average odds, and keep enough exchange balance for the liability.
What happens when the horse does not run?
| Bookmaker back | Exchange lay | Typical non-runner path | Action |
|---|---|---|---|
| Ante-post | Ante-post | Back loses; lay stands and wins | Reconcile both settled records |
| NRNB | Ante-post | Back refunded; lay stands and wins | Confirm the refund and exchange settlement |
| Day-of-race non-runner rules | Day-of-race market | Both can void | Check both rules and receipts |
| Any unclear or mismatched pair | Any unclear or mismatched pair | Unknown until rules are checked | Do not add another bet from memory |
The table is a reading method, not a promise about every operator. Betfair Exchange says ante-post bets generally stand whether the horse runs or not and makes no ordinary non-runner reduction to ante-post bets.[3] Smarkets likewise says ante-post bets stand whether the horse runs, except when a horse is balloted out, and says reduction factors do not apply to ante-post markets.[4]
Exceptions matter. Both rule sets contain special treatment for matters such as a horse being balloted out. Betfair Sportsbook also lists circumstances involving abandonment, venue changes, reopened entries and qualification.[1] Do not turn the useful shorthand "non-runner loses" into an absolute claim.
A horse that comes under starter's orders but refuses to race can also be treated differently from a declared non-runner. Check the official status and final settlement rather than relying on what happened visually at the start.
Seven checks before placing the hedge
- Same race and horse: check venue, date and exact selection.
- Market stage: identify ante-post, NRNB or day of race on each side.
- Placement time: save when each bet was accepted, not merely when you opened the page.
- Bet type: confirm win, each-way, place or another market and compare the place terms separately.
- Non-runner wording: read what happens if your horse does not start and what exceptions apply.
- Accepted exchange position: verify matched stake, average odds, liability and any unmatched remainder.
- Three-way cash map: calculate horse wins, horse loses and horse does not run.
Do not assume NRNB applies to every bet on the page. Betfair's current guidance says its selected offer applies to ante-post win or each-way bets after the race becomes NRNB.[2] It separately explains how certain bonus cash and free bets are treated.[2] Another operator's scope may differ.
If the terms are unclear, stop before placing the back bet. Asking support a precise question is cheaper than discovering the answer through settlement: "If I place this exact market now and the horse is declared a non-runner, is my cash stake returned?" Save the response with the market terms.
Common mistakes
- Seeing an NRNB badge today and assuming it covers a bet placed last week.
- Laying in a day-of-race tab while the bookmaker bet is ante-post, or the reverse.
- Checking only whether the horse name matches and ignoring market stage.
- Assuming a balloted-out horse follows the ordinary withdrawal rule.
- Using a two-outcome calculator without mapping the non-runner path.
- Moving to another lay before the first order's matched amount is known.
- Expecting an ante-post and day-of-race exchange position to net automatically.
The tidy workflow is less exciting and much more useful: save the terms, map three outcomes, place the hedge, verify the accepted bet, then reconcile the two accounts after settlement. Outplayed can help with offer instructions and calculations, but the live market labels and accepted rules still deserve your own check.
SEE OUTPLAYED'S MATCHED BETTING TOOLS ↗
COMMON QUESTIONS
Ante-post and NRNB FAQs
Does NRNB apply to bets placed before the offer started?
Do not assume so. Check the terms that were attached to the accepted bet. A race later being marked NRNB does not normally make an older ante-post bet refundable.
What does all in, run or not mean?
It means the ante-post bet generally stands even if the selected horse does not run, subject to the operator's stated exceptions.
Will an ante-post exchange lay be void if the horse is a non-runner?
Not usually under the cited Betfair and Smarkets ante-post rules. Matched bets generally stand, although specific exceptions can apply. Read the accepted exchange market rules.
Are ante-post and day-of-race exchange markets the same market?
No. Smarkets states that exposure is not combined and commission is payable separately between those market stages.
What if the horse is balloted out?
That can be an exception to the ordinary ante-post rule. Both cited exchange rulebooks say bets on a balloted-out horse can be voided. Check the final official status.
Can I rely on a screenshot of the NRNB banner?
Keep it, but also save the detailed terms and accepted receipt. The useful record shows the race, market, selection, stake, price, placement time and promotion wording.
