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If the enhanced price represents genuine value (and it often does, particularly on shorter-priced selections where the boost is meaningful), use it. Second, the exchange price reflects pure market opinion without any built-in margin, which makes it a more accurate indicator of the horse’s implied probability. Research on UK racing suggests that around 35 to 40 per cent of runners drift to a higher SP than their morning price. On horses that drift — less money than expected, price lengthening — BOG gives you the benefit of the higher SP. On horses that are supported in the market — money coming in, price shortening — BOG adds nothing, because the SP is lower than the price you took.
On the raceday market itself, there are consistent patterns. Ante-post markets on the Cheltenham Gold Cup or Champion Hurdle typically run between 140 and 160 per cent, which is lower than the National but still significantly wider than raceday. The aggregate effect across 20 runners adds up to a much wider margin than in a six-runner race. At the lower end, you find small-field Flat races — Group 1 contests with five or six runners where the form is well established and bookmakers compete aggressively on the headline price of the favourite. Across UK and Irish horse racing, typical bookmaker overrounds range from about 110 to 130 per cent.
That does not mean extra places are bad value — the additional place coverage can still be worth sports betting sites not on gamstop the wider margin, depending on the race — but it does mean you should not assume that an extra-places promotion is automatically a gift. Analysis from MatchedBettingBlog suggests that margins on extra-places markets can reach as high as 50 per cent. Bookmakers open with a cautious book and adjust as money comes in. The first show of prices in the morning — often called the early prices — tends to carry a wider margin than the Starting Price.
If the exchange offers 7.0 and the bookmaker offers 5/1, the bookmaker is taking a significantly larger margin on that runner, and you should either back on the exchange or find a bookmaker whose price is closer to the exchange level. If the exchange offers 6.0 and the bookmaker offers 5/1, the bookmaker is competitive after commission. The practical approach for most punters is to use both. When should you use the exchange, and when should you use a bookmaker? The commission you pay on an exchange winning bet reduces your effective odds.
The difference (28% vs 22.2%) represents potential value—the bookmaker is underestimating this horse’s chances according to your analysis. At decimal odds of 6.00, a £10 bet returns £60 total—your £10 stake plus £50 profit. The first number represents potential profit; the second represents the stake required to generate that profit.
BOG is a tool for capturing extra edge when your original selection was sound; it does not substitute for sound selection. Identify horses where you see value relative to implied probability. Alternatively, market support for another runner draws money away from your selection, and it drifts to 12/1 by the off. Throughout the day, money comes for the horse, and by race time it is 6/1 favourite. Lower overrounds indicate more competitive pricing; higher overrounds mean you need more accurate selections to overcome the margin. The sum of implied probabilities across all runners in a race reveals the bookmaker’s overround.
At 7/2, the same £1 stake returns £3.50 profit plus stake, totalling £4.50. This is the overround, and it is the first hurdle any punter must clear to profit long-term. In today’s day and age where automobiles have substituted the four legged animal, horses still retain importance. After landing two winners from three selections in his previous Champions League preview, Andy Schooler returns with three more best
Andy Schooler previews this week’s ‘Super Sunday’ Premier League showdown between Liverpool and Arsenal. Ross Burdon provides his latest stable update, with Gifts Differing set to run at Chelmsford on Thursday, while Dust Cover Dave Massey previews Saturday’s action at Aintree, selecting his best bets for the races at 1.15, 1.45, 2.25 and 3.00. Dave Chisnall spoke to kwiff on Friday afternoon just before he kicked off his Grand Slam of Darts qualifying campaign Manchester United host Aston Villa in Sunday’s featured Premier League clash, with both sides looking Hector Crouch heads to Southwell for three final rides on Saturday before jetting off to

