Going Changes and Late Market Moves

Most form study is done the night before. Declarations are in, the card is set, and you have read the races as they stand. Then the day itself starts moving. Rain arrives that the forecast only hinted at. The clerk of the course walks the track at 7am and changes the description. Horses come out. Prices that looked settled at breakfast are somewhere else by the first show.

Two things shift a race in its final hours: the ground and the money. The ground is a physical fact you can check, measure and reason about. The money is an opinion poll of thousands of strangers, some of whom know something and most of whom do not. Both are worth reading properly, and both are routinely read badly. This piece covers each in turn.

The going scales, Britain and Ireland

British turf going runs through six descriptions in everyday use: Firm, Good to Firm, Good, Good to Soft, Soft and Heavy. A seventh, Hard, exists in the rules but is effectively never returned. Ireland uses a finer scale with an extra grade, Yielding, between Good and Soft, so an Irish card can read Good to Yielding or Yielding to Soft where a British one would say Good to Soft.

All-weather tracks have their own vocabulary. The default is Standard, drifting to Standard to Slow when the surface is riding deep and occasionally Standard to Fast when it is quick. Britain races on Polytrack at Lingfield, Kempton and Chelmsford and on Tapeta at Newcastle, Wolverhampton and Southwell; Ireland's sole all-weather track, Dundalk, is Polytrack. Tapeta tends to ride a shade slower.

The GoingStick means are the BHA's own averages across all British fixtures from 2008 to 2013 (jumps means sit a little lower at the soft end). The BHA is explicit that this is not an official conversion scale: a reading is best judged against the course's own history, not a national table.

What the GoingStick actually measures

The GoingStick is a probe developed by TurfTrax and Cranfield University. The clerk pushes its tip into the turf, measuring penetration — the force needed to get it in — then pulls the handle back to 45 degrees, measuring shear, the energy a hoof needs to push off. The device averages at least 30 readings taken at set points around the track into a single number on a scale of 0 to 15, where 0 is waterlogged bog and 15 is tarmac. In reality almost everything falls between 5 and 10; the Racing Post's history of the device records the British extremes as 12.8 at Thirsk in 2009 and 2.7 at Haydock in 2016.

Publishing a reading has been a requirement of the Rules of Racing since January 2009, once at the declaration stage a few days out and again on raceday, alongside the clerk's verbal description. That gives you something the description alone cannot: precision and direction. "Good" covers a lot of ground, literally. A course reading 8.4 against its own Good average of 7.9 is on the quick side of Good, and a reading that falls from 7.8 at declaration to 7.1 on the morning tells you which way the surface is travelling. But treat the number with respect rather than reverence: clerks apply slightly different force, soils differ, and the same 7.5 does not ride identically at Goodwood and Haydock. It is a course-specific trend line, not a universal ruler.

How the surface changes through a card

Ground does not stand still between the morning report and the last race. Three things move it.

Watering is the routine one. The BHA's instruction to Flat courses is to aim for Good to Firm, and in any dry spell clerks water to hold it there — Epsom before the Derby, Goodwood and Ascot through their summer festivals. Watered ground is a manufactured surface, and when real rain lands on top of it, it often rides slower than the description suggests.

Rain during racing is the sharp one. Sustained rain can move a course a full grade across an afternoon, and the official description often lags the reality by a couple of races. Jockeys' comments after the first two races are worth more than the 7am report. So are the times: if the opener goes ten seconds slower than par for the course and distance, the ground is riding softer than advertised, whatever the board says.

Drying is the slow one, and the most underrated. A windy April day with sunshine can take a course from Soft to Good to Soft between the first and the last, so the fast-ground horses in the finale face a different test from the same types in the opener. Follow the clerk's updates through the card; the description you did your form study against last night may already be history.

Which horses actually care

Ground preference is real, but it is claimed far more often than it exists. Plenty of horses handle everything; the genuinely ground-dependent ones announce themselves in the form book if you read it coldly.

Look at the going for every run, which the Racing Post and Timeform print against each line of form, and ask whether the record splits cleanly. Figures of 1121 on Soft and Heavy against 0709 on quicker ground, over similar trips in similar company, are telling you something. A horse that has never met Soft is telling you nothing — absence of form is not negative form. And be suspicious of small samples: two defeats on fast ground, one from a bad draw and one over the wrong trip, do not make a soft-ground specialist.

Watch for the confound, too. Soft-ground form is often really weak-race form, because testing ground clusters in autumn and winter when the better Flat horses are away. Physical clues help at the margins — a round, high knee action suits give, a low skimming action suits quick ground — but the form line, honestly read, is the evidence. And the going reshapes the race around your horse as well as your horse itself: soft ground blunts pure speed, stretches fields out and puts a premium on stamina and position. A confirmed front-runner on ground it hates is two negatives, not one, which is where pace maps come in.

Non-runners on unsuitable ground

When the going changes materially after declarations, trainers can withdraw. British trainers may self-certify a non-runner — stating the reason, including a going change, without independent veterinary evidence — but the BHA polices it: a trainer whose self-certification rate exceeds 12% on the Flat or 9% over jumps loses the right for twelve months, and stewards can enquire if a horse withdrawn because of the ground turns up on identical going within a month.

For you, non-runners matter twice. First, the mechanics: if you took an early price, a withdrawal can trigger a Rule 4 deduction. Second, the race changes — remove the only other front-runner and last night's pace map is wrong; remove a market rival and every remaining price contracts. A rash of ground-related non-runners is itself information: trainers with horses on the course are telling you what they think the surface is really like.

Steamers and drifters: what a move actually says

A steamer is a horse whose price shortens significantly before the off — 7/2 (4.50) in the morning, 5/2 (3.50) at post time. A drifter goes the other way. The folklore says steamers are "expected" and drifters "unfancied", and directionally the folklore is right — but the useful part is what happens to the value.

The best public evidence is a study by Geegeez covering all UK Flat and all-weather racing from 2018 to 2022, comparing William Hill's opening show with Betfair SP and flagging moves worth 10% or more of implied win probability. Steamers won 13.5% of their races; drifters won 8%. The market's late verdict carries genuine information about who wins. But the returns ran the other way: backing the steamers at Betfair SP lost about 13.3p per £1 staked, while the drifters lost only around 1p per £1. The move was real, and it had overshot — by the time a steamer is visibly steaming, its price has already gone past anything the extra win chance justifies.

A late market move usually contains real information — steamers do win more often. But the information is already in the price by the time you can see it, and paying the new price has historically been the worse bet. Following moves is not a system; it is context.

It cuts both ways. A drift is not a death sentence — 8% of drifters still won, at prices that nearly covered the losses. A plunge promises nothing except a shorter price.

Late money, volume and the SP

Not all market moves are equal; when a move happens matters as much as its size. Morning prices are thin: modest stakes can shift a 10/1 (11.00) shot to 13/2 (7.50) without a single well-informed pound involved, and exchange markets are barely formed at breakfast. The serious liquidity arrives close to the off. Peter Webb of Bet Angel has put average matched volume on a UK race at around £500,000, from six figures on a weak midweek card to millions on a big Cheltenham or Ascot race, and the bulk of it is matched in the final minutes before the start.

That is why exchange volume tells you more than a price alone. A horse backed from 8/1 (9.00) into 5/1 (6.00) on £3,000 of matched money at 9am is a curiosity. The same move in the last ten minutes, with six figures matched, is the market meaning it. Watch the traded volume next to the price, not just the price.

The starting price sits at the end of all this. In Britain the SP is set by the independent Starting Price Regulatory Commission from a sample of bookmakers' prices at the off: the sampled prices are ranked, and the SP is the shortest price in the half of the list containing the longest odds — so at least half the sample was offering SP or bigger. Since the pandemic the sample has been drawn from off-course prices rather than the on-course ring, a change the SPRC made permanent. SP is therefore a snapshot of the market at its most liquid, best-informed moment, which is why late prices deserve more respect than early ones. The gap between a morning price and the eventual SP or BSP is a subject in itself; we cover it in SP, board price and BSP.

Signal or noise

So a horse is shortening. Before concluding anything, run through four questions.

When did it move? A plunge inside the last fifteen minutes, into deep liquidity, is worth more than anything that happened before noon. How much money is behind it? Check the exchange's matched volume, not just the price ladder. Does anything corroborate it — a going change that plainly suits, ground-related non-runners, a significant jockey switch? A move with a visible cause is more trustworthy than one without. And can you find a mundane explanation? A mention on morning television, a big tipping service's daily selection or a wave of social media noise will move a price sharply and mean nothing about the horse; that money is following a broadcast, not a gallop report. Some of the most confident-looking favourites are built exactly this way — the subject of spotting fake favourites.

Keep the conclusion modest, because the evidence demands it. The market near the off is a formidable aggregator, and the Geegeez numbers show that blindly following its moves — in either direction — has lost money. Losing is the normal outcome for most punters, and no amount of market-reading removes the margin built into every price. What the ground and the money offer is not an edge but a better understanding of the race in front of you: what the surface will ride like, which horses it helps, and whether the late move you are staring at is information or an echo. That understanding is the point. It is what the rest of the Academy is for.