This page explains how to make a sports book and calculate bookmakers over-round. This serves the punter well in calculating value bets for potential sports arbitrage betting. A knowledge of the bookmakers over-round helps the gambler understand betting odds. The sports book can be used as a basis for trading [buying and selling odds] on betting exchanges. It is possible in using this strategy to acheive risk free bets for moderate long term profit. For example, a small profit can be made if the same horse is bet a high odds then lyed at lower odds. The best time to use this approach is on the big horse racing festivals such as aintree, goodwood, ascot where the betting markets are strong and easier to predict.
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