not horse racing, but there's also a book by Steven Skiena titled "Calculated Bets: Computers, Gambling, and Mathematical Modeling to Win" -- it's about the au

not horse racing, but there's also a book by Steven Skiena titled "Calculated Bets: Computers, Gambling, and Mathematical Modeling to Win" -- it's about the author's interest in betting on jai-alai matches. there's a bit of stuff about parimutuel betting & understanding how the structure of jai-alai round robin tournaments can produce pretty unusual odds in some scenarios, which can be exploited. technologically the book is a couple of decades out of date, but it's probably worth a read.