"Compound Races" are Races that depend on other Races from which they are calculated or created. For example, an Average may be calculated from two or more races; the Average itself is a purely mathematical construct -- not one of the horses actually ran in the Average!
Compound Races are created and calculated by selecting race output format, the source data, confirming the race parameters and printing the results. No barrels are injured in the process!
For example, a Target Race (sometimes called a "Shootout") is a Compound Race. It is a mathematical construct that can be generated from the Open 4 D runs of two (or more) different shows. Whoever has the least difference between runs ( closest to tying herself ) is the winner.
Because of their complexity, each type of Compound Race is detailed in its own Help Section.