The bigger the field, the bigger the price
Every extra runner is another way for the favourite to get beaten — more traffic, more pace scenarios, more luck in running. The numbers march in one direction: as the field grows, the favourite's win rate falls, the average winner's price climbs, and the rate of genuine shocks rises steeply.
| Field size | Favourite wins | Avg winning SP | 10/1+ shocks | Races |
|---|---|---|---|---|
| 2-4 runners | 52.9% | 3.3 | 2.9% | 8,162 |
| 5-7 runners | 41.6% | 5.1 | 7.8% | 39,207 |
| 8-12 runners | 33.8% | 7.3 | 17.1% | 67,113 |
| 13-16 runners | 28.9% | 9.5 | 28.2% | 20,727 |
| 17+ runners | 25.2% | 11.6 | 39.3% | 5,175 |
Average winning SP shown as decimal odds (e.g. 7.0 = 6/1).
Big-field handicaps are where favourites go to lose — and where our model most often says pass. It scores every UK & Irish runner each morning and posts only its standout, free, before the off.
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It cuts both ways. A short price in a big-field handicap is doing it the hard way — the field alone is against it. And a fancied runner in a small field is worth more than the bare form suggests, because there's simply less that can go wrong. It's not a betting system (the price already reflects most of this — see how often each price wins); it's a lens for judging how much faith a result deserves.
Method. 140,384 UK & Irish races with starting prices, 2015–2026. "Favourite wins" counts races won by the (joint-)shortest price; "shock" is a winner sent off 10/1 or bigger. Past results don't guarantee the future. 18+ · BeGambleAware.