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Mathematically, that means that some other horse’s *' odds have to be higher than 91, to keep the field’s odds balanced. And here is where bookies do their thing, and where you can too.
Say you have a six-horse field. The odds on every horse should be 5-1. You pick out one horse that you think has a better chance ( it really doesn’t matter which one) and make it 2-1. Then you structure the rest of the field at 5-2, 3-1, 7-2, 4-1, and 5-1.
92.9%