Swiftly,
I don't know how to write the correct equation for you, but yours doesn't include, and compensate for, the 50% of the time when both your horses lose.
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Vic
"The race may not always be to the swift, nor the victory to the strong, but that's how you bet." - Damon Runyon
"I don't like money actually, but it quiets my nerves." - Joe Louis
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