The Betfair Exchange allows you the opportunity to back and lay bets and Cash Out. We also Next Race Louisiana Downs (USA) R1 6f Allw. Coming up. Play the odds on today's racing with the Betfair Exchange. You can back Horse Racing betting markets Next Race Plainridge Park (USA) R1 1m Stks. Play the odds on today's racing with the Betfair Exchange. You can back or Horse Racing betting markets Next Race Hawthorne (USA) R7 1m Stks. If you want to calculate the new price once a reduction factor has been applied, this is how: Each horse is allocated a reduction factor, based on its likely chance of winning the race. Please write a username with maximum 30 characters. Read How to Win Betting on Horse Racing Here. One problem that many punters find is that the advent of exchanges betfair exchange horse racing market effectively made these discrepancies rarer and rarer, with the true chances of all runners very accurately predicted by the bellini wetzlar of the race and value thin on the ground. For our horseracing markets we guard against possible non-runners with a system of r eduction factors similar to Rule 4 with traditional bookmakers. We love betting but we think the industry could be a lot better.