I don't think there are any real successful betting system out there, but there is an interesting site called horseracegame.com that actually allows you to simulate upcoming major races
I play at that site. I don't really know if it's good for handicapping races or betting systems, though they do provide upcoming major stake races, but it really is a cool 3D action game.
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There are many profitable horse racing systems. The most profitable of these horse racing systems are the ones that are big.