Tricast Non-Runner Rules: What Happens When a Horse Withdraws

You placed your tricast last night. This morning, one of your horses is scratched. The trainer pulled them due to unsuitable ground, or a minor setback in training, or simply a change of plan. Your carefully selected 1-2-3 combination is now missing a leg.

What happens next depends on how many of your selections have been withdrawn—and the specific rules your bookmaker applies. Non-runner scenarios do not automatically void your bet. Instead, the tricast is restructured according to standard industry rules that convert your original wager into a different bet type.

Understanding these rules before race day prevents surprises at settlement. One non-runner produces a forecast bet. Two non-runners leave you with a single. Three non-runners void the bet entirely. Each scenario carries different implications for potential returns and whether you remain interested in the race at all.

The rules are standardised across major UK bookmakers, though minor variations exist. William Hill’s published terms provide a representative example: when a horse is withdrawn from a tricast, the bet is settled as a straight forecast on the remaining selections. When two are withdrawn, it becomes a Starting Price single on the remaining horse. This framework applies whether you placed a straight or combination tricast.

One Non-Runner Scenario

When a single horse from your tricast is withdrawn, the bet converts to a straight forecast on your two remaining selections. The horse you nominated for first must still win, and the horse you nominated for second must still finish runner-up. The withdrawn horse’s position in your original tricast is simply removed from the equation.

Consider a tricast backing Horse A to win, Horse B second, and Horse C third. If Horse C is withdrawn, your bet becomes a forecast: A to win, B to finish second. The payout, should you win, is calculated using the Computer Straight Forecast formula for forecasts rather than tricasts. This typically produces a lower dividend than the original tricast would have paid, because you are predicting only two positions rather than three.

If you placed a combination tricast, the conversion is more complex. Your six permutations become multiple forecast combinations. A-B-C, A-C-B, B-A-C, B-C-A, C-A-B, and C-B-A each convert according to which horse was withdrawn. With C out, the effective forecasts become A-B, A-B (from A-C-B), B-A, B-A (from B-C-A), A-B (from C-A-B treated as forecast on remaining), and B-A. Some bookmakers consolidate duplicates; others settle each line separately. Check your specific bookmaker’s terms for exact handling.

The practical effect is a reduced potential payout. Forecasts pay less than tricasts because they are easier to hit—you only need to predict two places instead of three. However, you remain in the race with a live bet. If your remaining two horses finish 1-2 in the order you specified, you collect the forecast dividend multiplied by your stake.

Settlement is automatic. You do not need to contact your bookmaker or request a conversion. The non-runner triggers the restructuring; you simply receive whatever payout results from the new bet type.

Two Non-Runners Scenario

When two of your three selections are withdrawn, the tricast converts to a Starting Price single on your remaining horse. You are no longer betting on finishing order—just whether your one remaining selection wins the race.

This represents a significant change in bet structure and potential returns. A tricast might have paid £500 if successful. The SP single on your remaining horse, if it wins at, say, 8/1, pays £9 per £1 stake. The gap between these outcomes is vast.

The horse’s position in your original tricast does not matter for settlement purposes. Whether you had them to finish first, second, or third, the conversion produces the same SP single. If they win, you receive Starting Price odds multiplied by your stake. If they finish anywhere other than first, you lose.

For combination tricasts, the calculation applies across your total stake. If you placed a £1 combination tricast (£6 total outlay) and two horses are withdrawn, you effectively hold a £6 SP single on the remaining horse. A winner at 10/1 returns £66 (£60 profit plus £6 stake). This might feel like salvaging something from a broken bet—or it might feel like poor value compared to the tricast you originally intended.

Some punters request bet cancellation when facing significant restructuring. Most bookmakers will not cancel bets after the final declaration stage, but some offer discretion in exceptional circumstances. If you strongly prefer not to have your tricast convert to a single, contacting customer service before the race may be worthwhile—though success is not guaranteed.

The two-non-runner scenario highlights the risk of building tricasts around horses with fragile profiles. Frequent non-runners, horses prone to minor issues, or those with trainers who withdraw at short notice increase the probability of restructuring your exotic bet into something far less attractive.

All Three Non-Runners

If all three horses in your tricast are withdrawn, the bet is void. Your stake is returned in full. No profit, no loss—you simply receive your money back as if the bet had never been placed.

This scenario is rare but not impossible. A trainer with multiple runners in the same race might withdraw the entire string due to unsuitable ground. A virus outbreak at a yard could see several horses scratched simultaneously. More commonly, the combination of unrelated withdrawals happens to eliminate all your selections by coincidence.

Void bets settle quickly. Online accounts typically see the stake returned within minutes of the race going off without your horses. Betting shop slips require a visit to collect, but the refund is automatic once the shop processes the race result.

For accumulator purposes, a void leg is treated as if it never existed. If your tricast was part of a larger multiple, the accumulator continues without that leg, and odds are recalculated accordingly. The void tricast neither wins nor loses—it simply disappears from the bet structure.

Non-Runner Outside Your Selection

When a horse is withdrawn from the race but is not one of your three tricast selections, your bet proceeds unchanged. You still need your chosen horses to finish 1-2-3 in the specified order (straight) or any order (combination). The non-runner is irrelevant to your bet structure.

However, non-runners outside your selection can still affect your payout. The Computer Straight Forecast formula considers the Starting Prices of all runners in calculating the dividend. When horses are withdrawn, the remaining field becomes smaller and potentially less competitive. This can influence the CSF calculation in unpredictable ways.

In general, smaller fields produce lower tricast dividends. With fewer horses, the task of predicting the 1-2-3 becomes statistically easier, and the formula adjusts accordingly. If three horses are scratched from a 12-runner race, leaving nine at the start, your tricast payout may be compressed compared to what a 12-runner field would have generated.

The effect depends on which horses are withdrawn. If the non-runners include heavily-backed favourites, the remaining market may shift in ways that actually increase dividends for certain results. If outsiders are withdrawn while the fancied horses all run, dividends might decrease. The relationship is not linear or easily predicted.

From a practical standpoint, you cannot control non-runners outside your selection. Monitor the morning declarations to understand field composition, but accept that last-minute scratchings may shift dividend expectations in either direction. Your fundamental bet—these three horses to fill the places—remains intact regardless of what happens elsewhere in the field.

Know Before Race Day

Non-runners restructure your tricast rather than void it—unless all three selections are withdrawn. One non-runner converts your bet to a forecast. Two non-runners leave you with an SP single. Three non-runners return your stake.

These rules apply automatically. You do not need to contact your bookmaker; settlement follows the standard framework. However, understanding the implications before race day helps you make informed decisions about which horses to include in your tricasts.

Horses with reliable attendance records—those who routinely make it to post without late scratchings—reduce the risk of unwanted bet conversions. Trainers known for withdrawing at short notice, or horses with histories of minor setbacks, introduce the possibility that your carefully constructed tricast becomes something far less appealing.

Know before race day. Check declarations on the morning of the race. If a key horse is missing, you still have a live bet—but the nature of that bet has changed, and your expected returns have likely diminished.