StableBet
Professor Furlong and Pascal at the AI Lab
THE AI LAB
THE AI LAB · SYSTEMS & STRATEGIES

Every betting system, tested and ranked

A betting system is any fixed rule that decides what you back or how you stake, applied to every qualifying race with no judgement calls. We run each one over real British races and settle it the way your wallet would: industry Starting Price, fallers and pulled-up horses counted as the losses they are. The finding worth having is the spread. The habits at the top of this board cost a small fraction of what the ones at the bottom cost, so what you choose to back changes what you keep far more than most punters expect. None of them clears the bookmaker's margin over a sample this size, and the board shows exactly where each one lands and how often it comes in.

29 systems tested · 30,904 races · every result published

Win or lose, the record is the record. Under test this week: Four-fold on favourites (−31.4p per £1 staked).

New to odds? What a price really means. Or read Lab Notes.

The Betting Systems Leaderboard

Every tracked system ranked by real-world return, least-bad first. No system on this board turns a profit; the ranking shows which habits leak slowest. Tap a strategy to read its full experiment.

Updated 1 November 2026 · 30,904 races settled

29 systems tested · 30,904 real races · none beat the bookmaker's margin. The best real return is −0.8p in the pound, so even the strongest system is a net loss. The bookmaker's margin is the reason.

#StrategyWho proposed itReal return (per £1)£/weekSampleStrike£200/week → today
1The AI's most-confident picksThe ProfessorGuest: RishiAI persona, modelled−0.8p−£2361——
2Odds-on favourites onlyThe systemsGuest: BarryAI persona, modelled−5.3p−£115,202wins 60%−£922
3Favourite in a big fieldThe systemsGuest: BarryAI persona, modelled−7.5p−£15694wins 24%—
4Favourite in a small fieldThe systemsGuest: CarolAI persona, modelled−7.7p−£154,378wins 46%—
5Favourite over jumpsThe systemsTested system−7.9p−£1610,861wins 37%−£2,224
6Festival favouritesThe systemsGuest: CarolAI persona, modelled−8.0p−£162,402wins 32%—
7Each-way the favouriteThe basicsGuest: EddieAI persona, modelled−8.7p−£1730,904places 62%—
8Favourite on soft groundThe systemsGuest: CarolAI persona, modelled−8.7p−£1711,515wins 35%—
9Back the favouriteThe basicsTested system−9.0p−£1830,904wins 35%−£1,852
10Favourite in handicapsThe systemsGuest: BarryAI persona, modelled−9.2p−£1820,651wins 31%—
11Favourite on the FlatThe systemsTested system−9.6p−£1920,043wins 34%—
12Follow the AIThe ProfessorGuest: RishiAI persona, modelled−11.4p−£236,601——
13Back the second favouriteThe basicsGuest: SandraAI persona, modelled−12.1p−£2430,902wins 21%−£3,439
14Top-rated horseThe basicsGuest: FrankAI persona, modelled−15.5p−£3127,420wins 19%−£4,046
15Top-rated in handicapsThe systemsGuest: FrankAI persona, modelled−16.1p−£3220,631wins 16%—
16Double on two favouritesThe multiplesPascal, the punter−17.2p−£34———
17Lucky 15 on favouritesThe multiplesPascal, the punter−17.9p−£36———
18A random horseThe basicsGuest: DawnAI persona, modelled−21.4p−£4330,904wins 13%−£7,020
19Back the lowest drawThe systemsGuest: StanAI persona, modelled−24.8p−£5020,019wins 12%—
20Back the old stagersThe systemsGuest: CarolAI persona, modelled−27.7p−£559,050wins 8%—
21Each-way an outsiderThe basicsGuest: EddieAI persona, modelled−30.7p−£6129,033wins 7%—
22Four-fold on favouritesThe multiplesPascal, the punter−31.4p−£63———
23Back the outsiderThe basicsGuest: LornaAI persona, modelled−35.8p−£7230,904wins 3%−£6,249
24Four-fold on random horsesThe multiplesPascal, the punter−61.9p−£124———

A new system reaches this board every week through Pascal's Panel, where one of our AI punters proposes a strategy and Professor Furlong tests it on real British races with the method shown.

What it costs you a week

The same £200 a week on each system, so the bars compare like for like. Every bar is below the line: this is the weekly cost of the habit, from a graze to a bloodbath.

Favourite over jumps−£16Each-way the favourite−£17Back the favourite−£18Back the second favourite−£24Top-rated horse−£31Lucky 15 on favourites−£36A random horse−£43Four-fold on favourites−£63Back the outsider−£72Four-fold on random horses−£124

And where that leaves you over time

A real punter staking £200 a week, balance running week by week, for the seven single-bet habits we track: the kind of bets you can actually watch unfold. The lines wobble (a longshot lands, a favourite obliges) but they all drift the same way: down. Tap a name to show or hide its line.

−£7,000−£6,000−£5,000−£4,000−£3,000−£2,000−£1,000£0Dec '24Apr '25Aug '25Dec '25Mar '26Jul '26balance

One habit, week by week

The favourite line from the chart above, drawn as it happened: 3 races a day at £10 a bet, to starting price. The numbers and the dates are the ones in the table, not a re-telling.

Back the favourite, 3 races a day at £10 a bet, balance running week by week from Dec '24 to Oct '26.Rendered from data to 1 November 2026.
What this shows, in words

A line chart of one punter’s balance backing the favourite in every race, 3 races a day at £10 a bet, to starting price. It starts at zero in Dec '24, wobbles as favourites win and lose, and drifts down to −£1,852 by Oct '26. The bookmaker’s margin is paid on every bet, so the line has nowhere to go but down.

How the loss grows with every bet

Every strategy on this board loses, and the longer you play the more it costs. Here is each one at 100, 500, 1,000, 2,500 and 5,000 bets at £10 a bet: the average loss, ranked least-bad first, with the spread nine in ten runs land inside a tap away.

One warning on reading the averages. Where a bet can land a rare enormous winner, the average is not what most people get, because those few wins pull it up and most runs never see one. Open any row and the typical result sits beside it.

Strategy100 bets500 bets1,000 bets2,500 bets5,000 bets
Odds-on favourites only−£54−£268−£535−£1,339−£2,677▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£53at 500 bets: −£268at 1,000 bets: −£538at 2,500 bets: −£1,331at 5,000 bets: −£2,678

9 in 10 runs land between P5 and P95:

at 100 bets: −£187 to +£80at 500 bets: −£563 to +£23at 1,000 bets: −£951 to −£122at 2,500 bets: −£2,006 to −£678at 5,000 bets: −£3,619 to −£1,740

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite in novice and maiden races−£68−£338−£675−£1,688−£3,376▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£69at 500 bets: −£339at 1,000 bets: −£676at 2,500 bets: −£1,691at 5,000 bets: −£3,373

9 in 10 runs land between P5 and P95:

at 100 bets: −£248 to +£114at 500 bets: −£731 to +£64at 1,000 bets: −£1,239 to −£108at 2,500 bets: −£2,584 to −£778at 5,000 bets: −£4,639 to −£2,100

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite over hurdles−£70−£349−£698−£1,744−£3,488▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£71at 500 bets: −£351at 1,000 bets: −£700at 2,500 bets: −£1,746at 5,000 bets: −£3,487

9 in 10 runs land between P5 and P95:

at 100 bets: −£272 to +£140at 500 bets: −£804 to +£117at 1,000 bets: −£1,337 to −£50at 2,500 bets: −£2,768 to −£718at 5,000 bets: −£4,956 to −£2,027

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite in a big field−£75−£376−£752−£1,880−£3,759▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£80at 500 bets: −£384at 1,000 bets: −£755at 2,500 bets: −£1,898at 5,000 bets: −£3,739

Read that line, not the one above it. Over 100 bets the average is −£75, but the typical run ends at −£80. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£349 to +£207at 500 bets: −£989 to +£241at 1,000 bets: −£1,614 to +£145at 2,500 bets: −£3,268 to −£504at 5,000 bets: −£5,698 to −£1,785

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite in a small field−£77−£386−£771−£1,928−£3,855▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£79at 500 bets: −£385at 1,000 bets: −£772at 2,500 bets: −£1,930at 5,000 bets: −£3,851

9 in 10 runs land between P5 and P95:

at 100 bets: −£243 to +£95at 500 bets: −£767 to +£0at 1,000 bets: −£1,310 to −£229at 2,500 bets: −£2,772 to −£1,071at 5,000 bets: −£5,067 to −£2,647

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite over jumps−£79−£393−£786−£1,965−£3,930▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£80at 500 bets: −£395at 1,000 bets: −£792at 2,500 bets: −£1,965at 5,000 bets: −£3,936

9 in 10 runs land between P5 and P95:

at 100 bets: −£284 to +£135at 500 bets: −£859 to +£79at 1,000 bets: −£1,449 to −£130at 2,500 bets: −£3,007 to −£913at 5,000 bets: −£5,401 to −£2,439

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Festival favourites−£80−£401−£802−£2,005−£4,011▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£84at 500 bets: −£400at 1,000 bets: −£808at 2,500 bets: −£2,000at 5,000 bets: −£4,011

9 in 10 runs land between P5 and P95:

at 100 bets: −£304 to +£157at 500 bets: −£911 to +£125at 1,000 bets: −£1,524 to −£62at 2,500 bets: −£3,146 to −£848at 5,000 bets: −£5,644 to −£2,375

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Each-way the favourite−£87−£434−£867−£2,168−£4,336▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£88at 500 bets: −£433at 1,000 bets: −£868at 2,500 bets: −£2,174at 5,000 bets: −£4,331

9 in 10 runs land between P5 and P95:

at 100 bets: −£235 to +£64at 500 bets: −£770 to −£97at 1,000 bets: −£1,340 to −£395at 2,500 bets: −£2,920 to −£1,408at 5,000 bets: −£5,387 to −£3,265

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite on soft ground−£87−£435−£870−£2,176−£4,352▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£90at 500 bets: −£441at 1,000 bets: −£881at 2,500 bets: −£2,181at 5,000 bets: −£4,342

9 in 10 runs land between P5 and P95:

at 100 bets: −£297 to +£134at 500 bets: −£912 to +£46at 1,000 bets: −£1,546 to −£186at 2,500 bets: −£3,255 to −£1,105at 5,000 bets: −£5,881 to −£2,815

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Back the favourite−£90−£450−£899−£2,249−£4,497▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£92at 500 bets: −£457at 1,000 bets: −£900at 2,500 bets: −£2,254at 5,000 bets: −£4,493

9 in 10 runs land between P5 and P95:

at 100 bets: −£303 to +£132at 500 bets: −£928 to +£38at 1,000 bets: −£1,583 to −£214at 2,500 bets: −£3,340 to −£1,158at 5,000 bets: −£6,025 to −£2,972

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite over fences−£91−£457−£913−£2,283−£4,566▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£94at 500 bets: −£457at 1,000 bets: −£918at 2,500 bets: −£2,285at 5,000 bets: −£4,570

9 in 10 runs land between P5 and P95:

at 100 bets: −£302 to +£124at 500 bets: −£930 to +£28at 1,000 bets: −£1,586 to −£225at 2,500 bets: −£3,368 to −£1,197at 5,000 bets: −£6,058 to −£3,037

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite in handicaps−£92−£458−£915−£2,289−£4,577▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£94at 500 bets: −£461at 1,000 bets: −£922at 2,500 bets: −£2,288at 5,000 bets: −£4,581

9 in 10 runs land between P5 and P95:

at 100 bets: −£318 to +£148at 500 bets: −£975 to +£68at 1,000 bets: −£1,646 to −£172at 2,500 bets: −£3,421 to −£1,128at 5,000 bets: −£6,233 to −£2,932

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite on the all-weather−£96−£478−£956−£2,390−£4,780▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£98at 500 bets: −£481at 1,000 bets: −£958at 2,500 bets: −£2,388at 5,000 bets: −£4,786

9 in 10 runs land between P5 and P95:

at 100 bets: −£311 to +£126at 500 bets: −£964 to +£14at 1,000 bets: −£1,640 to −£261at 2,500 bets: −£3,489 to −£1,307at 5,000 bets: −£6,317 to −£3,242

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite on the Flat−£96−£480−£961−£2,402−£4,805▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£99at 500 bets: −£482at 1,000 bets: −£970at 2,500 bets: −£2,399at 5,000 bets: −£4,796

9 in 10 runs land between P5 and P95:

at 100 bets: −£313 to +£128at 500 bets: −£974 to +£14at 1,000 bets: −£1,656 to −£255at 2,500 bets: −£3,495 to −£1,304at 5,000 bets: −£6,340 to −£3,220

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Back the second favourite−£121−£606−£1,211−£3,028−£6,056▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£127at 500 bets: −£607at 1,000 bets: −£1,221at 2,500 bets: −£3,045at 5,000 bets: −£6,063

9 in 10 runs land between P5 and P95:

at 100 bets: −£397 to +£172at 500 bets: −£1,240 to +£52at 1,000 bets: −£2,106 to −£301at 2,500 bets: −£4,438 to −£1,585at 5,000 bets: −£8,049 to −£4,022

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Favourite in Class 1 races−£125−£627−£1,253−£3,133−£6,266▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£126at 500 bets: −£633at 1,000 bets: −£1,254at 2,500 bets: −£3,138at 5,000 bets: −£6,269

9 in 10 runs land between P5 and P95:

at 100 bets: −£324 to +£85at 500 bets: −£1,078 to −£168at 1,000 bets: −£1,898 to −£589at 2,500 bets: −£4,153 to −£2,099at 5,000 bets: −£7,705 to −£4,796

A run that sits ahead of the average is luck, not an edge. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Top-rated horse−£155−£773−£1,547−£3,867−£7,734▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£180at 500 bets: −£805at 1,000 bets: −£1,569at 2,500 bets: −£3,893at 5,000 bets: −£7,747

Read that line, not the one above it. Over 100 bets the average is −£155, but the typical run ends at −£180. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£491 to +£248at 500 bets: −£1,570 to +£103at 1,000 bets: −£2,684 to −£298at 2,500 bets: −£5,724 to −£1,955at 5,000 bets: −£10,348 to −£5,032

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Top-rated in handicaps−£161−£803−£1,607−£4,017−£8,034▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£187at 500 bets: −£826at 1,000 bets: −£1,622at 2,500 bets: −£4,054at 5,000 bets: −£8,048

Read that line, not the one above it. Over 100 bets the average is −£161, but the typical run ends at −£187. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£519 to +£280at 500 bets: −£1,661 to +£120at 1,000 bets: −£2,846 to −£290at 2,500 bets: −£6,007 to −£1,973at 5,000 bets: −£10,829 to −£5,136

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Double on two favourites−£172−£859−£1,717−£4,293−£8,585▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£183at 500 bets: −£861at 1,000 bets: −£1,715at 2,500 bets: −£4,270at 5,000 bets: −£8,500

Read that line, not the one above it. Over 100 bets the average is −£172, but the typical run ends at −£183. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£545 to +£250at 500 bets: −£1,729 to +£76at 1,000 bets: −£2,934 to −£413at 2,500 bets: −£6,231 to −£2,227at 5,000 bets: −£11,282 to −£5,635

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Lucky 15 on favourites−£179−£896−£1,792−£4,480−£8,960▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£195at 500 bets: −£915at 1,000 bets: −£1,803at 2,500 bets: −£4,471at 5,000 bets: −£8,936

Read that line, not the one above it. Over 100 bets the average is −£179, but the typical run ends at −£195. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£425 to +£135at 500 bets: −£1,486 to −£226at 1,000 bets: −£2,642 to −£852at 2,500 bets: −£5,831 to −£3,002at 5,000 bets: −£10,875 to −£6,890

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

A random horse−£215−£1,073−£2,145−£5,363−£10,726▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£226at 500 bets: −£1,082at 1,000 bets: −£2,159at 2,500 bets: −£5,377at 5,000 bets: −£10,735

Read that line, not the one above it. Over 100 bets the average is −£215, but the typical run ends at −£226. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£338 to −£55at 500 bets: −£1,372 to −£714at 1,000 bets: −£2,584 to −£1,665at 2,500 bets: −£6,070 to −£4,603at 5,000 bets: −£11,745 to −£9,673

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Back the lowest draw−£248−£1,242−£2,484−£6,211−£12,422▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£303at 500 bets: −£1,298at 1,000 bets: −£2,574at 2,500 bets: −£6,287at 5,000 bets: −£12,470

Read that line, not the one above it. Over 100 bets the average is −£248, but the typical run ends at −£303. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£666 to +£318at 500 bets: −£2,291 to +£66at 1,000 bets: −£4,034 to −£686at 2,500 bets: −£8,735 to −£3,410at 5,000 bets: −£16,064 to −£8,538

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Back the old stagers−£277−£1,384−£2,768−£6,919−£13,838▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£320at 500 bets: −£1,438at 1,000 bets: −£2,800at 2,500 bets: −£6,949at 5,000 bets: −£13,861

Read that line, not the one above it. Over 100 bets the average is −£277, but the typical run ends at −£320. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£722 to +£325at 500 bets: −£2,510 to −£123at 1,000 bets: −£4,378 to −£986at 2,500 bets: −£9,525 to −£4,145at 5,000 bets: −£17,507 to −£9,986

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Each-way an outsider−£307−£1,533−£3,066−£7,665−£15,330▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£385at 500 bets: −£1,627at 1,000 bets: −£3,167at 2,500 bets: −£7,768at 5,000 bets: −£15,438

Read that line, not the one above it. Over 100 bets the average is −£307, but the typical run ends at −£385. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£798 to +£450at 500 bets: −£2,849 to +£147at 1,000 bets: −£4,993 to −£793at 2,500 bets: −£10,841 to −£4,117at 5,000 bets: −£19,929 to −£10,392

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Four-fold on favourites−£314−£1,570−£3,139−£7,848−£15,695▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£466at 500 bets: −£1,705at 1,000 bets: −£3,293at 2,500 bets: −£7,987at 5,000 bets: −£15,855

Read that line, not the one above it. Over 100 bets the average is −£314, but the typical run ends at −£466. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£1,000 to +£968at 500 bets: −£3,676 to +£1,055at 1,000 bets: −£6,272 to +£545at 2,500 bets: −£12,925 to −£2,222at 5,000 bets: −£22,916 to −£7,658

Share of runs where every single bet lost and nothing at all came back:

at 100 bets: 17% (£1,000 gone)

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Back the outsider−£358−£1,790−£3,580−£8,950−£17,900▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£510at 500 bets: −£1,970at 1,000 bets: −£3,778at 2,500 bets: −£9,198at 5,000 bets: −£18,120

Read that line, not the one above it. Over 100 bets the average is −£358, but the typical run ends at −£510. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£1,000 to +£785at 500 bets: −£3,580 to +£562at 1,000 bets: −£6,245 to −£322at 2,500 bets: −£13,338 to −£4,006at 5,000 bets: −£24,373 to −£10,854

Share of runs where every single bet lost and nothing at all came back:

at 100 bets: 5% (£1,000 gone)

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Four-fold on random horses−£619−£3,096−£6,193−£15,482−£30,965▾

The figures above are the average. Half of all runs finish worse than this:

at 100 bets: −£1,000at 500 bets: −£5,000at 1,000 bets: −£10,000at 2,500 bets: −£24,599at 5,000 bets: −£45,731

Read that line, not the one above it. Over 100 bets the average is −£619, but the typical run ends at −£1,000. The gap is a handful of enormous winners dragging the average up, and most runs never see one.

9 in 10 runs land between P5 and P95:

at 100 bets: −£1,000 to −£619at 500 bets: −£5,000 to +£1,024at 1,000 bets: −£10,000 to +£4,946at 2,500 bets: −£25,000 to +£11,575at 5,000 bets: −£50,000 to +£23,031

Share of runs where every single bet lost and nothing at all came back:

at 100 bets: 97% (£1,000 gone)at 500 bets: 86% (£5,000 gone)at 1,000 bets: 74% (£10,000 gone)at 2,500 bets: 47% (£25,000 gone)at 5,000 bets: 23% (£50,000 gone)

A run that sits ahead of the average is luck, not an edge, and on a bet like this it takes one rare slip landing to do it, which is why the band is so wide. The average line is the bookmaker’s margin doing its work, and it only steepens as the bets add up.

Multiples (the doubles, accumulators and the Lucky 15) are counted per slip: one bet means one whole slip, so their columns compare like for like with the singles. Their average is the single-leg return compounded over the legs, the same figure the table above carries, because a winning slip is far too rare to average from real ones: a four-fold of random horses lands about twice in seven thousand. The spread around it comes from simulated slips, each leg drawn at random from the same races.

Martingale and Fibonacci are missing by design: their stakes depend on the exact order results arrive in, so a shuffle-and-resample test would be invalid for them. They live as chronological studies instead: does the Martingale system work? and does Fibonacci staking work?

The AI's own rows are not simulated here either; the model's live record, wins and losses alike, is on the track record.

Follow the AI: model ledger dataset - see the track record

The AI's most-confident picks: model ledger dataset - see the track record

Browse the strategy library

Each card shows who backs the idea, what it is trying to exploit, and what it actually does: search for the ones you have heard about, or browse by kind. The full working sits one click in.

Staking systems (2)
Fibonacci stakingThe Martingale's cultured cousin: stakes climb the Fibonacci sequence after losses, gentler than doubling but built on the same hope, that a staking pattern can outrun a margin it never touches.
Return /£1
+4.93% at 6,765 units
Strike
—
Effort
Popularity
Swings
Read the full analysis →The Martingale doubling planDouble the stake after every loss so the first winner claws the lot back. It aims to exploit the fact that losing runs must end: the question is whether the bankroll ends first.
Return /£1
Bankroll bust
Strike
—
Effort
Popularity
Swings
Read the full analysis →
Backing & laying strategies (22)
Carol backs this , the conditions specialistBack the favourite on the all-weatherNo bog, no firm patches, the same surface all year. The theory says taking the weather out lets the form stand up. Easy form is easy for the market too.
Return /£1
−9.6p
Strike
wins 34%
Effort
Popularity
Swings
Read the full analysis →Carol backs this , the conditions specialistBack the favourite over fencesFences test jumping and stamina, so the proven chaser should hold up. The theory trusts the record over fences. A faller still loses the whole stake.
Return /£1
−9.1p
Strike
wins 34%
Effort
Popularity
Swings
Read the full analysis →Frank backs this , the form puristBack favourites in Class 1 racesThe Group, Graded and Listed races, where the best horses meet and the form is deepest. The theory says the top tier gives the fairest favourite. The sharpest money is there first.
Return /£1
−12.5p
Strike
wins 35%
Effort
Popularity
Swings
Read the full analysis →Barry backs this , the favourite-chaserBack the favourite in big fieldsThe contrarian cousin: back the jolly exactly where it is hardest, in the cavalry charges. Bigger prices on the favourite, in exchange for far more ways to be beaten.
Return /£1
−7.5p
Strike
wins 24%
Effort
Popularity
Swings
Read the full analysis →Barry backs this , the favourite-chaserBack the favourite in handicapsHandicaps exist to make every horse equal, which should be the favourite's worst nightmare. This tests whether the market's pick survives the handicapper's levelling.
Return /£1
−9.2p
Strike
wins 31%
Effort
Popularity
Swings
Read the full analysis →Carol backs this , the conditions specialistBack the favourite in small fieldsFewer runners, fewer ways to lose. It backs the jolly only when the field is thin, banking on less traffic and less chaos between the favourite and the line.
Return /£1
−7.7p
Strike
wins 46%
Effort
Popularity
Swings
Read the full analysis →Liam backs this , the stable loyalistBack favourites in novice and maiden racesThin form, beginners everywhere, so when one horse is all the money the stable must know. The favourite wins often. The confidence is already in the price.
Return /£1
−6.8p
Strike
wins 46%
Effort
Popularity
Swings
Read the full analysis →Carol backs this , the conditions specialistBack the favourite on soft groundWhen the mud flies, form is meant to be worth more: proven stamina beats flashy speed. It backs the jolly only when the going rides soft or worse.
Return /£1
−8.7p
Strike
wins 35%
Effort
Popularity
Swings
Read the full analysis →Barry backs this , the favourite-chaserBack the favourite on the FlatThe same trusted habit, summer edition. Tighter handicaps and bigger fields make the Flat a harsher test of whether the market's first choice earns its billing.
Return /£1
−9.6p
Strike
wins 34%
Effort
Popularity
Swings
Read the full analysis →Carol backs this , the conditions specialistBack the favourite over hurdlesLower obstacles, fewer fallers, so the best horse gets a clean run. The theory takes the big fences out of the jumps game. The market prices the clean run in.
Return /£1
−7.0p
Strike
wins 39%
Effort
Popularity
Swings
Read the full analysis →Barry backs this , the favourite-chaserBack the favourite over jumpsThe winter staple. Over hurdles and fences, class and jumping are meant to sort the field, so the form should count double. Wins often: the price already knows.
Return /£1
−7.9p
Strike
wins 37%
Effort
Popularity
Swings
Read the full analysis →Barry backs this , the favourite-chaserBack odds-on favourites onlyOnly bet when the market is near-certain: short prices, high strike, tiny returns. The steadiest ride on the board, and a test of whether near-certainty is priced fairly.
Return /£1
−5.3p
Strike
wins 60%
Effort
Popularity
Swings
Read the full analysis →Carol backs this , the conditions specialistBack the old stagersThe sentimental system: back the oldest horse in the race, the one that has seen it all. It tests whether experience is underrated or just old.
Return /£1
−27.7p
Strike
wins 8%
Effort
Popularity
Swings
Read the full analysis →Barry backs this , the favourite-chaserBack the favourite in every raceThe plainest habit in racing: back the market's first choice, every time. It leans on the crowd being right, and the crowd usually is: the question is what being right costs once the margin is in the price.
Return /£1
−9.0p
Strike
wins 35%
Effort
Popularity
Swings
Read the full analysis →Lorna backs this , the longshot-romanticBack the outsider of the fieldTake the biggest price on the card and wait for the shock. It aims to exploit the days when racing goes mad, and prices in how rarely those days come.
Return /£1
−35.8p
Strike
wins 3%
Effort
Popularity
Swings
Read the full analysis →Sandra backs this , the contrarian value-hunterBack the second favouriteOne step off the jolly, hunting the horse the crowd nearly loves. The idea is that the favourite soaks up all the attention and the value hides just behind it.
Return /£1
−12.1p
Strike
wins 21%
Effort
Popularity
Swings
Read the full analysis →Frank backs this , the form puristBack the top-rated horseFollow the official ratings instead of the market: back the horse the handicapper says is best. It tests whether expert judgement holds any edge the prices have missed.
Return /£1
−15.5p
Strike
wins 19%
Effort
Popularity
Swings
Read the full analysis →Dawn backs this , the social punterPick a horse at randomThe pin, formalised. No reading, no opinion, pure chance: the control experiment every other strategy on this board has to beat before it can claim anything.
Return /£1
−21.4p
Strike
wins 13%
Effort
Popularity
Swings
Read the full analysis →Frank backs this , the form puristBack the top-rated in handicapsRatings against the handicapper on his own turf. If official figures carry any private edge, the races built on those figures are where it should show.
Return /£1
−16.1p
Strike
wins 16%
Effort
Popularity
Swings
Read the full analysis →What's the best AI for horse racing tips?They read a card fast and well, but none has a proven edge over the market yet.
Return /£1
Racecraft ranking
Strike
—
Effort
Popularity
Swings
Read the full analysis →Rishi backs this , the AI-trusterBack only the AI's most confident picksWait for the model's strongest signals and ignore the rest. It tests whether confidence is a filter that finds value, or just a shorter price with better manners.
Return /£1
−0.8p
Strike
—
Effort
Popularity
Swings
Read the full analysis →Rishi backs this , the AI-trusterFollow the AI's pick in every raceBack our model's top-rated runner in every single race, no filter, no judgement. The purest test of whether a well-calibrated machine survives the market at full volume.
Return /£1
−11.4p
Strike
—
Effort
Popularity
Swings
Read the full analysis →
Market mechanics (1)
Stan backs this , the staking-plan believerBack the lowest drawSome tracks are meant to hand the inside stalls a head start. This backs the lowest-drawn runner everywhere, to see whether the famous draw bias pays once it is in the price.
Return /£1
−24.8p
Strike
wins 12%
Effort
Popularity
Swings
Read the full analysis →
Bet types (7)
Each-way in the big handicapsThe big-field handicaps pay four, five, sometimes six places. This hunts the corners of the card where the each-way terms are set generously: the rare structural quirk worth understanding.
Return /£1
-14.15% to +7.41%
Strike
—
Effort
Popularity
Swings
Read the full analysis →Aaliyah backs this , the acca-dreamerFour-fold on favouritesFour favourites, one slip, one big number if they all oblige. The acca trades four small edges against you for one large payout: the maths of why is the interesting bit.
Return /£1
−31.4p
Strike
—
Effort
Popularity
Swings
Read the full analysis →Aaliyah backs this , the acca-dreamerDouble on two favouritesChain two favourites together and let the winnings roll on. Two likely winners feel almost safe, and the bookmaker collects a margin on each leg of the parlay.
Return /£1
−17.2p
Strike
—
Effort
Popularity
Swings
Read the full analysis →Aaliyah backs this , the acca-dreamerFour-fold on random horsesThe lottery ticket dressed as a bet: four random runners in one acca. It exists on this board to show what stacking pure chance actually costs.
Return /£1
−61.9p
Strike
—
Effort
Popularity
Swings
Read the full analysis →Aaliyah backs this , the acca-dreamerLucky 15 on favouritesFour picks, fifteen bets: every single, double, treble and the acca, so any winner returns something. Maximum coverage, maximum turnover, and the margin taxes every one of the fifteen.
Return /£1
−17.9p
Strike
—
Effort
Popularity
Swings
Read the full analysis →Eddie backs this , the each-way optimistEach-way an outsiderThe Saturday classic: a big-priced runner, each-way, hoping it sneaks into the places. It aims at the gap between a longshot's place chance and what the bookie pays for it.
Return /£1
−30.7p
Strike
wins 7%
Effort
Popularity
Swings
Read the full analysis →Eddie backs this , the each-way optimistEach-way the favouriteHalf the stake on the win, half on the place, so a near-miss still pays. It trades the top of the winnings for a steady drip of place returns, comfort, at a price.
Return /£1
−8.7p
Strike
places 62%
Effort
Popularity
Swings
Read the full analysis →
Meeting-specific (2)
Carol backs this , the conditions specialistBack favourites at the festivalsCheltenham, Aintree, Ascot: the deepest, most-studied races of the year. The theory says festival favourites are the truest form picks in racing. The margin attends the festivals too.
Return /£1
−8.0p
Strike
wins 32%
Effort
Popularity
Swings
Read the full analysis →Back the favourite at Royal AscotOne meeting, maximum quality, every eye in racing on the form. If the market's first choice earns its keep anywhere, the royal meeting should be it.
Return /£1
34.8% vs 34.6%
Strike
—
Effort
Popularity
Swings
Read the full analysis →

Return and strike are measured on real races, settled at industry Starting Price. Effort, popularity and swings are our editorial scores from one to five (swings is computed from the £200-a-week money path where one exists). Every card opens the full experiment with the sample, the error bars and the method.

The kinds of system we test

  • Staking systems. Change the stake, not the horse: Martingale and friends bet that a staking pattern can outrun a margin it never touches.
  • Backing & laying strategies. Fixed selection rules, the favourite, the outsider, the top-rated: each one bets that a corner of the form book is underpriced.
  • Market mechanics. Quirks of how prices form, the draw, running styles: these hunt structural edges, and the question is always whether the price already knows.
  • Bet types. The same horses in different wrappers, each-way, doubles, accumulators: the wrapper decides how many times you pay the margin.
  • Meeting-specific. Favourite habits pointed at one meeting, the festivals, Royal Ascot: deeper races, smaller samples, honest error bars.

Everything settles the same way, and the full conventions are on How We Test.

The big questions, answered in full

Not strategies to follow: the comparative reads that make sense of the whole board.

Do any betting systems beat the market?The whole board in one read: every system we have tested, ranked, with the error bars and the honest arithmetic of why the margin is so hard to clear.Read it →How often does a 100/1 shot actually win?Everyone remembers the famous shocks. The record shows how rare they really are, and what chasing them costs between the fairy tales.Read it →How much does form move the odds?A win last time out changes a price before you ever see it. This read measures how much of the form book is already inside the odds by the time you bet.Read it →Do front-runners really win more?Racing folklore says speed from the gates wins races. The data has a view on when running style genuinely matters, and when it is already priced.Read it →Does the model's confidence predict profit?When the machine is surest, is it rightest, and is being right even enough? A read on calibration, confidence and why the two are not the same as value.Read it →
Live · The AI, tested

The Silicon Tipster League →

ChatGPT, Gemini, Grok, Claude and DeepSeek tip every race, settled at SP: one test blind, one with the market shown. Watch five AIs prove themselves live, from scratch.

Playable · You, tested

Can you beat the bookies? Play the strategy game →

Pick a strategy from this library and back it yourself through thousands of the same real races, virtual £10,000 at £10 a race, real Starting Prices. Qualify at 1,000 bets and take your place on the leaderboard.

Betting systems: the questions everyone asks

Straight answers, from the data, to the things people (and search engines) ask about these systems. Tap a question.

The basics

Do betting systems actually work?
No. We tested 29 common systems against 30,904 real British races, with fallers and pulled-up horses counted as the losing bets they are, and not one made a profit. The least-bad bet, odds-on favourites, still leaks about 5.3%, and most lose far more: backing the favourite is down 9.0%, a random horse 21.4%, a four-fold of favourites 31.4%. The bookmaker's built-in margin is in every price, and no fixed selection or staking rule removes it.
Can you beat the bookies long term?
Not with a system. Every one of the 29 systems we tested across 30,904 races lost money to starting price, and the least-bad of the lot, odds-on favourites, still leaks about 5.3%. The reason is the over-round, the margin baked into every price, which averages about 12% a race. We even built an AI model to find a fairer price and it was less accurate than the market itself (model Brier 0.095 versus the market's 0.089), which shows how hard the book is to beat.
What does it really mean that no system beats the bookmaker?
It means the loss is structural, not bad luck. The bookmaker prices every race so the runners' implied chances add up to more than 100%, so the average bet is a loser before the race is run, and no fixed rule strips that margin out. We confirmed it by testing all 29 systems on real results, counting fallers as losers, and by building a model that still could not out-price the market. The honest takeaway is to bet only for fun with money you can afford to lose, never as a way to make money.

The bookmaker edge

What is the over-round (the bookmaker's margin)?
The over-round is the bookmaker's built-in edge. Add up the implied chances of every runner from their prices and a fair book would total 100%, but a real book totals more, and that extra is the margin. Across our 30,904 races it averages about 12% per race, and it grows with field size: small fields are close to fair, while big handicaps of 16 or more runners carry around 30%. That margin is why the average bet loses before luck even comes into it.
How much does field size change the bookmaker's margin?
A lot. The over-round is close to fair in small fields, sits around 12% in mid-sized races, and climbs to roughly 30% in big fields of 16 or more runners. That is why large, competitive handicaps are the worst value on the card: more runners give the bookmaker more places to bury the margin. If value matters to you, small fields cost you the least, though they still cost you.
What is the favourite-longshot bias?
It is the long-standing pattern that short-priced horses are less bad value than long-priced ones, even though both lose on average. In our data the loss rate climbs steadily with the odds: odds-on favourites lose about 5.3%, while genuine outsiders are down about 35.8% and win just 2.6% of the time. Punters over-bet longshots chasing the big win, so bookmakers pad those prices the hardest. The bias means short prices are less bad value, not that any of them is good value.
Why do longshots lose more than favourites?
Because of the favourite-longshot bias. Punters are drawn to the big payout of a long price, so outsiders are over-bet relative to how often they actually win, which lets bookmakers pad those prices hardest. In our data backing the outsider loses about 35.8% and wins only 2.6% of the time, against about 5.3% lost on odds-on favourites. The longer the price, the more of the bookmaker's margin you quietly absorb.
Why does backing the favourite still lose if favourites win most often?
Because winning often is not the same as being priced fairly. Favourites do win the largest share of races, but their prices already build in the bookmaker's margin, so the payout when they win does not cover the times they lose. Spread across our 30,904 races that leaves backing the favourite about 9.0% down to starting price. Winning frequently protects you from big swings, but it cannot overcome a price set against you.

Specific bets

Is backing the favourite profitable?
No. Backing the favourite in every race loses about 9.0% of your stakes to starting price over the long run. Favourites win often, but the bookmaker's margin still grinds you down, and beaten favourites that fall or pull up cost you the whole stake. It is steadier than chasing big odds, but steady losing is still losing.
Is the second favourite a good bet?
No. Backing the second favourite loses about 12.1% to starting price over the long run, more than backing the favourite (9.0%). This follows from the favourite-longshot bias: as you step out to longer prices the value gets worse, not better. The idea that the second favourite is an overlooked sweet spot does not hold up in the data.
Is each-way betting better value?
No. Each-way betting is two bets in one, a win part and a place part, so it does not escape the bookmaker's margin, it just splits your stake across it. Each-way the favourite loses about 8.7% over the long run. The place part pays out more often, which softens the swings, but the standard place terms are set to keep the house edge intact. It manages variance, it does not turn a losing edge into a winning one.
Are accumulators (accas) worth it?
No, they are the worst value of all because they multiply the bookmaker's margin once for every leg. A four-fold of favourites loses about 31.4%, a Lucky 15 about 17.9%, and a four-fold of random horses about 61.9%, so well over half of every pound staked disappears. All the legs landing together is rare, which is exactly why the advertised payouts look so big. The size of the prize is a measure of how unlikely you are to collect.
Is the jumps favourite the one system that has made money?
No. Backing the favourite over jumps loses about 7.9%, but it is not the worst favourite bet, and it never made money. So many jumpers fall or pull up that you lose all those stakes, yet once everything is settled honestly the jumps favourite is actually one of the less-bad favourite bets: the favourite on the Flat (about 9.6%) and the favourite in handicaps (about 9.2%) are both worse. An earlier figure on this page overstated the jumps damage, because a settlement bug wrongly counted winnerless races as losses and made it look like the worst of the lot. We have corrected that. The fallers still cost you and it is still a clear loss, it is just not the steepest favourite bet.

Systems and tipsters

Do staking plans like the Martingale help?
No. Plans like the Martingale, where you double your stake after every loss to chase back what you lost, change the shape of your wins and losses but never the underlying edge. Every bet still carries the bookmaker's margin, so the long-run expectation stays negative. Worse, a normal losing run can balloon your stakes to amounts you cannot cover or that hit the bookmaker's maximum bet, turning a string of small losses into one big one.
Is following a tipster or model profitable?
Almost never once costs are included. A tipster or model can only profit by consistently finding horses priced longer than their true chance, and the market is very good at pricing, so that edge is rare and fragile. Our own AI model, trained on form, conditions, and weather, was less accurate than the market (a Brier score of about 0.095 versus the market's 0.089), and backed blind it lost about 11.4%, much like the favourite. Past results and confident write-ups are not evidence of a future edge.
Did your AI model find a way to win?
No. Backed blind in every race the model loses about 11.4%, much like backing the favourite. Its most-confident picks roughly break even, but that is on a small, jumps-heavy sample and sits within noise of zero, so it is not a profit. The model is actually less accurate than the market (Brier 0.095 versus 0.089), which is the clearest proof that the book is hard to beat: even a purpose-built model could not out-price it.

The bottom line

What is the safest way to bet?
There is no genuinely safe way to bet, because every bet carries the bookmaker's margin and the long-run expectation is negative. If you do bet, the least-bad value is short prices in small fields, where the over-round is lowest and the favourite-longshot bias hurts least, while accumulators and big-field longshots are the worst. The only truly safe choice is to treat any stake as money you are happy to lose for entertainment, and to set a fixed budget. Betting is not a way to make money.
So what should I take away from all this?
That the maths is settled and it is not in your favour. Across 30,904 real races not one of the 29 systems we tested made a profit, the least-bad still leaks about 5.3%, and the bookmaker's roughly 12% margin per race is the reason. No selection rule, staking plan, tipster, or AI removes it. Bet only for fun, with money you can afford to lose, and never as a plan to get ahead.
The money view

What does a betting habit cost in real life? →

The honest money talk: what the popular habits cost per week, month and year, what that money would buy at the races instead, and how to make it last longer.

This is research, not tips. The numbers describe what each system has done over a large, honest sample; they are not a signal to stake. The model is a calibrated read on a race and does not beat the market. 18+, please bet responsibly: free and confidential help is at BeGambleAware.org.