Why the Odds Look Too Good
Look: a horse’s place price flashes on the screen, “5.0” for win, “2.0” for place. You think the bookmaker is being generous. Wrong. They’ve already slipped a hidden fee into that “each-way” combo.
Understanding the Overround
Here is the deal: every market has an overround, the sum of implied probabilities that exceeds 100 %. For a simple win market, the bookmaker adds about 5-7 % to guarantee profit. In an each-way market they double-dip.
Imagine a 10-horse race. The true odds might sum to 95 % probability. The bookmaker bumps it to 105 % for the win leg. Then they repeat the same markup for the place leg, even though the place leg only covers a subset of horses. The net effect? A 10-15 % margin hidden in plain sight.
Mechanics of the Place Leg
By the way, the place leg isn’t a separate market. It’s a sliced-off version of the win market, usually paying 1/4 or 1/5 of the win odds. The bookmaker calculates the place odds from the same pool, applies the same overround, then scales it down. So the place leg inherits the win leg’s margin, then some.
Take a 5-horse place race paying 1/5. The win odds might be 4.0, 6.0, 8.0, 10.0, 12.0. The place odds look like 2.0, 3.0, 4.0, 5.0, 6.0. Those numbers look tidy, but they’ve been pruned to keep the bookmaker’s edge intact across both legs.
Why the Margins Differ by Market
And here is why: the place market is thinner. Fewer bets, less liquidity, higher volatility. Bookmakers compensate by inflating the overround. In low-profile events, the place leg can carry a 20 % margin. In high-profile races, they may shave it to 8 % to stay competitive.
Hidden Tricks in the Fine Print
Look again at the terms. “Place odds are calculated on the full pool, not the win pool.” That phrase is a smokescreen. It means the place leg draws from the same bettor contributions, so the bookmaker’s margin is effectively doubled.
And the kicker: the “each-way” price is quoted as a single figure, but it’s actually two separate bets. You pay twice the stake, you get two chances to win, and you pay two times the margin.
How to Spot the Margin
Do the math. Convert the odds to implied probabilities, sum them for win and place separately. If the total exceeds 100 % by more than the typical 5-7 %, you’ve found the hidden edge.
For example, a win leg at 4.0 (25 %) and a place leg at 2.0 (50 %) sum to 75 %. Add the implied probabilities of the other horses, and you’ll see the overround ballooning well beyond the norm.
What to Do With This Knowledge
Here’s the actionable advice: always split the each-way ticket into two separate bets, calculate the true expected value of each, and compare it to the market’s implied probability. If the place leg’s overround is too high, skip it. Use the link How Bookmakers Build Margin Into Each-Way Odds to sharpen your edge.
