When I handicap races for dirt, I cross out all turf races in the pp's and vice versa, because I believe the surfaces are almost completely different.
The only way one surface affects my handicapping on the other is conditioning, and if a dirt sprinter can handle a dirt route is if it had already run well in a turf route, for example.
I don't use variants on turf races, except for off courses, because so few are run in a given day, but I do on dirt.
Since Beyer, Bris, etc. incorporate variants in their turf numbers, I find them unreliable.
So I make my own figures for all surfaces.
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