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Strategic use of BOG requires understanding when to bet and when to wait. This promotion exists because bookmakers are competing for early-morning turnover. A six-runner race where implied probabilities sum to 112% has a 12% overround—meaning the bookmaker’s theoretical margin is 12% before any punter places a bet.

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It is the bookmaker’s theoretical profit margin before a single bet is settled. In practice, they always sum to more — typically between 110 and 130 per cent for horse racing — and that excess is the overround. In a perfectly fair market with no margin, the implied probabilities of all runners in a race would sum to exactly 100 per cent.

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. There is a subtlety that experienced exchange users understand and newcomers often miss. The back price might be 6.0 but only fifty pounds is available at that price, and the lay price might be 7.0 — a gap that represents poor value for anyone trying to trade. That difference — roughly 10 per cent on the individual price — is the cost of the bookmaker margin.

But without calculating implied probability, you cannot begin to answer that question systematically. For odds comparison across multiple bookmakers, decimal format saves time and reduces errors. This format dominates betting exchanges and has become standard on many online platforms, particularly for European customers. At 4/6 (sometimes written 4-6), you need to stake £6 to win bookmakers £4 profit, returning £10 total from a £6 stake. Before diving into specific strategies, we need to establish fluency with the formats you will encounter. A horse drifting from 5/1 to 7/1 represents an opportunity for those who took the early price under Best Odds Guaranteed.

Understanding those differences is where value lives. The bookmaker margin is built into every price, but how wide that margin is varies enormously between operators, between race types, and between the fixed-odds market and the betting exchange. Yet the majority of bettors place their bets with whichever app they last used, at whatever price happens to be on screen, without checking whether a better number is available elsewhere. Horse racing odds comparison is the single most important habit a punter can develop, and it is also the one most punters neglect.

The first show of prices in the morning — often called the early prices — tends to carry a wider margin than the Starting Price. 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.

Now that you have a basic understanding of how odds work, and the different ways they are represented, you can compare them online and get the best bet possible. The money line is mostly used by the American bookies, which clearly displays an underdog, and a favorite. The right side of the fraction is your stake while the left side represents the Winnings for each unit. Cathryn Fry previews Saturday’s Remembering Envoi Allen Champion Chase at Down Royal, assessing the chances of Heart Wood, Romeo Coolio,

There are practical considerations that limit BOG value. Using the exchange as a benchmark — even if you ultimately bet with a bookmaker — is one of the most effective habits a punter can develop. 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.