Method & strategy
What does DOB stand for?
Double Or Bust. You back a horse before the off and leave a lay at half the price, so if the price halves in-running you end up with roughly your stake as profit either way; if it doesn't, you usually lose the stake.
How often do horses trade at half their BSP in-running?
Across 115,385 qualifying UK and Irish runners between 9 Nov 2025 – 9 Nov 2026, 32.5% did. Among beaten runners it was 25.0%. It varies a lot by price: see the price guide.
Is dobbing profitable?
We don't make that claim, and nobody can promise it. The numbers here are historical frequencies measured against BSP, which isn't the price you'd get, and the in-play low isn't tick-perfect. A matched dob wins about one stake before commission and an unmatched one loses a stake, so the arithmetic is unforgiving.
Why is the minimum BSP 2.02?
Half of 2.02 is 1.01, the lowest price Betfair allows. Below 2.02, the price can't halve.
Courses
Which course has the highest DOB rate?
Among courses with 500+ qualifying runners in 9 Nov 2025 – 9 Nov 2026, Aintree at 41.3%. See all courses.
Why does my local course have a “small sample” warning?
Courses with under 300 qualifying runners in the window get a warning, because a handful of races can swing their rate. Rates aren't shown at all under 30 runners.
Are all-weather and turf split?
Not yet. Betfair's files don't label the surface, and we don't guess. Where a course races on both, its numbers are combined.
Race types
How do you work out the race type?
From Betfair's race name, for example “2m4f Nov Hcap Hrd” is a handicap hurdle. The methodology lists the rules.
Which race type has the most runners hitting half their price?
Among race types with 500+ qualifying runners, Hunter & Cross-Country Chase at 40.8%. Among beaten runners only, Hunter & Cross-Country Chase at 33.9%.
Why do some horses show “n/a” for a run?
Either the BSP was under 2.02, or Betfair recorded no in-play low for that runner. Those runs don't count towards any rate.
Tools
Where does the data come from?
Betfair's free daily BSP files for UK and Irish win markets, at promo.betfair.com/betfairsp/prices. Every runner row on the site links to its source file.
How often is the tracker updated?
Daily. Each morning the pipeline downloads the previous day's files and rebuilds the site.
Can I download the data?
You can download the original files straight from Betfair. We link to the exact file behind every runner.
Do you recommend any trading software?
Not yet. We plan to cover the main tools, and any paid listing will be clearly labelled as sponsored.
The Dobbing Report
Each week: which courses, race types and horses traded at half their BSP in-running, straight from Betfair's own files. Numbers, not tips.