The main advantage to using your own numbers is you know which days the variant was all over the place and the SR is probably not very reflective of the race the horse ran. The main advantage of using somebody else's numbers is they do all tracks and you get a number for a shipper from a track you don't figure. Besides you don't have to do all the work. Believe me, making even a decent SR for just one circuit is a lot of work. Pay CJ the money, his numbers are worth it if SRs are a major part of your method. Even Beyer's numbers are probably better than anything you can come with on your own.
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Some day in the not too distant future, horse players will betting on computer generated races over the net. Race tracks will become casinos and shopping centers. And some crooner will be belting out "there used to be a race track here".
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