I compiled these numbers from bris data, showing how the various running styles at Hawthorne and Arlington compare, and also the effect of poly at Arlington. Basically you can see that not all dirt tracks are created equal as Hawthorne is what I would call speed biased. Poly seems more fair because it breaks out more equally between early speed and closers.
Percent of races won – six furlongs
Hawthorne spring meet 2007
E type 47%, E/P type 28%, P type 12%, S type 13%
Arlington 2006 meet (dirt)
E type 35%, E/P type 32%, P type 18%, S type 15%
Arlington 2007 meet (poly)
E type 31%, E/P type 24%, P type 16%, S type 29%
Percent of races won – 1 1/16 miles
Hawthorne spring meet 2007
E type 42%, E/P type 22%, P type 12%, S type 19%
Arlington 2007 meet (poly)
E type 32%, E/P type 17%, P type 24%, S type 27%
Percent of races won – one mile
Arlington 2006 meet (dirt)
E type 30%, E/P type 28%, P type 21%, S type 22%
Arlington 2007 meet (poly)
E type 32%, E/P type 20%, P type 22%, S type 26%
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