Forecast Bets Test Your Form-Reading Accuracy
Forecast and tricast betting in horse racing asks a harder question than a standard win or each-way bet. Instead of picking one horse to finish first, you’re predicting the first two finishers (forecast) or the first three (tricast) — and in the straight versions of these bets, the order matters. Get it right and the returns can be substantial. Get one position wrong and the bet is dead.
These bet types reward deep form analysis. They are not suited to casual punting or quick hunches, because the probability of nailing an exact finishing order drops sharply as the field size increases. With average Flat field sizes at Premier racedays reaching 10.86 in 2024 — the highest post-pandemic figure, according to BHA data — the number of possible first-and-second combinations in a typical race runs well into double figures. In a ten-runner field, there are ninety possible exact forecast outcomes. Your bet covers one of them.
Straight Forecast vs Reversed Forecast
A straight forecast requires you to name the first and second-placed horse in the correct order. Horse A first, Horse B second. If they finish in reverse order — B first, A second — the bet loses. There is no partial payout, no consolation. The specificity is what drives the price: straight forecast returns are calculated after the race using the Computer Straight Forecast formula and tend to be considerably higher than win odds, precisely because the task is considerably harder.
A reversed forecast covers both possible orders. Horse A first and B second, or B first and A second. Either result pays out. The cost is double that of a straight forecast — you’re placing two bets rather than one — but the coverage is meaningfully broader. If you believe two horses will fill the first two places but can’t confidently separate them, the reverse forecast is the logical structure.
A combination forecast extends this further. Instead of selecting just two horses, you can pick three, four, or more to fill the first two positions in any combination. Three selections create six possible permutations (each horse can finish first or second with each other horse). Four selections create twelve permutations. The cost multiplies accordingly — a combination forecast with four horses at £1 per permutation costs £12 — but it gives you coverage across a wider pool of contenders, which is useful in competitive races where three or four horses have strong claims.
The practical question is always the same: does the cost of coverage justify the expected return? A combination forecast with four selections at £1 per line costs £12. If the winning combination pays a CSF of £25, your profit is only £13. If it pays £80, the trade was excellent. The races that suit combination forecasts are those where you’re confident in a group of horses but uncertain about the precise order — big-field handicaps where form points to a cluster of credible contenders rather than a clear first and second.
Tricast Bets and Combination Options
A tricast takes the forecast principle and adds a third dimension: you must predict the first, second, and third-placed horse. In the straight tricast, the order must be exact. In a combination tricast, your selected horses can finish in the top three in any arrangement.
The mathematics become intimidating quickly. In a twelve-runner race, there are 1,320 possible exact tricast outcomes (12 x 11 x 10). Your straight tricast covers one of them. The improbability is reflected in the returns — Computer Tricast payouts in competitive handicaps routinely reach triple figures from a £1 stake, and four-figure returns are not unusual when outsiders fill the frame.
Combination tricasts multiply the coverage and the cost. Three selections in any order give you six permutations. Four selections give you twenty-four. Five selections produce sixty permutations, and a £1 unit stake now costs £60. At this point, you need a substantial Computer Tricast return just to break even, and the bet becomes more a speculative wager than a form-based exercise.
The most effective tricast strategy is restraint. Limit yourself to three or at most four selections, use the combination option to cover the order, and target races where the form narrows the likely front-runners to a manageable group. Trying to include five or six horses increases the cost faster than it improves the probability of winning.
CSF Payouts — How They’re Calculated
Unlike fixed-odds win bets, forecasts and tricasts placed with bookmakers are settled at the Computer Straight Forecast or Computer Tricast return — an industry-standard formula derived from the starting prices of the horses involved. You don’t know the payout until after the race.
The CSF formula takes the SP of the first and second-placed horse, adjusts for the overall market, and produces a return per £1 staked. A forecast of two well-backed horses — say, the favourite and second favourite — might return £8 to £15. A forecast involving a longer-priced winner and a placing outsider can return £50, £100, or significantly more. The CSF inherently rewards the punter who identifies unexpected finishing orders, because the formula is anchored to SPs that reflect collective market opinion.
The Computer Tricast formula works on the same principle, applied to three horses rather than two. Returns are naturally larger because the difficulty is greater. A tricast involving three well-fancied horses in a short-priced race might pay £20 to £40. The same bet type involving two unconsidered horses pays substantially more.
One consequence of CSF-settled bets is that the payout can be higher or lower than you expected based on the morning prices. If the market shifts between when you placed the bet and the race itself — a selection drifting from 5/1 to 10/1, for instance — the CSF will reflect the final SP, not the morning price. This can work for or against you, and it means forecasts and tricasts don’t benefit from promotions like Best Odds Guaranteed.
Races Where Forecast and Tricast Betting Works Best
Forecasts and tricasts perform best in races where you have strong views on multiple runners. Conditions races and non-handicap events with six to ten runners are the sweet spot: fields are large enough to produce rewarding payouts but small enough that form analysis can meaningfully narrow the contenders.
In small fields of four or five, the CSF returns are usually modest because the likely outcomes are predictable and the formula reflects that low uncertainty. There’s little value in correctly predicting first and second in a four-runner race where the top two in the betting filled those positions — the payout will barely justify the effort.
At the other extreme, big-field handicaps — sixteen or more runners — offer spectacular potential returns but demand either exceptional form-reading or, frankly, a degree of luck. Favourites win roughly 30 to 35 per cent of UK races overall, but in large-field handicaps that figure drops. Predicting not just the winner but the runner-up in a race where the outcome is genuinely open is a task of high difficulty. Combination forecasts and tricasts manage the uncertainty by covering multiple orders, but the cost of that coverage eats into the potential profit.
The disciplined approach is to treat forecast and tricast betting as a supplement to your main activity, not the core of it. Place them in races where your form analysis gives you two or three strong contenders and a view on how the race will be run. Leave the mass-coverage combination tricasts for the occasional big-field handicap where you’re happy to spend the stake for the thrill of a potentially large return.