Wednesday 23 September 2026 steamers and drifters: San Juanito at Kempton Park

The market for Wednesday 23 September 2026 has moved since the morning show. Listowel, Goodwood, Redcar, Perth and Kempton Park still have racing to come, and since the morning market the biggest move has been for San Juanito at Kempton Park, while Case Study at Kempton Park has gone the other way. Of the day's 36 races, 34 were still to be run when the opening show was set against the morning market, the next of them the McSweeney Brothers Maiden Hurdle at 13:55 at Listowel, and the moves below are drawn from those races alone.

The morning market is the price the day's predictions recorded for each runner before the first show; the opening show is the middle bookmaker price in the Lab's first snapshot of the day, exchanges left out. A steamer is a runner whose price has shortened between the two, a drifter one whose price has lengthened, and a move is a description of the market's opinion, never advice.

Every runner, with the model's estimated chance beside the price, is on the racecards page.

Steamers: San Juanito at Kempton Park

The biggest shorteners have all moved sharply since the morning market, largest first: San Juanito has shortened for the Unibet Supports Safer Gambling Handicap at 19:00 at Kempton Park, Dontspoilasale has shortened for the Industry Leading In-Play Markets At Unibet Handicap at 18:30 at Kempton Park and Golden Circet has shortened for the Unibet More Extra Place Races Handicap at 20:00 at Kempton Park. The card below is the race San Juanito runs in, the biggest single move on the day, with the model's estimated chance for each runner beside the chance the morning market implied.

The model rates Whitesnake its most likely winner, and the market has come for San Juanito since the opening show. The model's estimate was made before the first show and does not move with the market, so the gap between its column and a steamer's price is a difference of opinion, not a verdict on either; the track record settles every one of its picks at starting price. The course itself is covered in the Kempton Park guide.

Drifters: Case Study at Kempton Park

The biggest lengtheners have all moved sharply since the morning market, largest first: Case Study has drifted for the Racing TV Fillies' Handicap at 17:30 at Kempton Park, Prometteuse has drifted for the Paul Moynihan (Ex VFI President) Memorial Flat Race at 17:22 at Listowel and Status Symbol has drifted for the Unibet/EBF Restricted Novice Stakes (GBB/GBBPlus Race) (Div 1) at 16:20 at Kempton Park. The card below is the race Case Study runs in, the biggest single drift on the day, with the model's estimated chance beside the morning market's.

A drift is the market's opinion changing, and the reasons range from a non-runner or a change of going to a stable's own confidence, none of which the price itself explains. The model does not react to it: its estimate is the same one the morning card carried, which is why a drifter can sit above the market in the left column and below it in the right. The horse tracker follows any runner on the card to its next entry, whichever way its price went.

The cost of backing early

Taking a price before the off means taking the bookmaker's margin at that moment, and the margin is paid whichever way the price then moves: a steamer rewards the early price and a drifter punishes it, but the excess the book keeps over a whole field is built into both. The table below is the latest published margin for each book the Lab tracks, compiled from the previous evening's prices, so it describes the card as it was sold then rather than the lunchtime board.

What betting costs has the working behind the margin, and the Tipster League shows what taking a price every day does to the AI tipsters over a season, losses included.

Elsewhere in the Lab: Is Betting on Horses Just a Mug's Game?.

Common questions

Which meetings race on Wednesday 23 September 2026?

Listowel in Ireland, and Goodwood, Redcar, Perth and Kempton Park in Britain. Every card is on the racecards page with the model's estimated chance beside each runner, and all of them still have racing to come.

What is a steamer?

A runner whose price has shortened since an earlier market, here the morning market recorded in the predictions file. The opposite move, a price lengthening, makes a drifter.

Does a steamer win more often?

The Lab makes no such claim. A shortening price is the market's opinion strengthening, and the track record settles the model's own picks at starting price rather than at the price they opened at, so the answer for any system is a running figure over every day, not a rule.

Where do the prices come from?

From the Lab's own snapshot of the bookmakers' boards, taken in the late morning and compared with the morning market the model priced against. Exchange prices carry commission and are left out.

How are the AI tipsters doing?

The Tipster League settles every AI pick at starting price and publishes the running total, losses included.

A word on all of this

None of the above is a tip, and no system the Lab has tested has made money over the whole record. Bet only what you can afford to lose. If gambling has stopped being fun, BeGambleAware has free, confidential help.