Model v3 · 24 Surf×Dist×Class logistic regression models · 42,397 training entries. Rows with blank OO excluded. Surf: 1=Fast Dirt, 2=Turf, 4=Poly. Dist: 1=Dirt Sprint, 2=Dirt Route, 3=Turf Sprint, 4=Turf Route, 5=Poly Sprint, 6=Poly Route. Class: 1=S, 2=A+, 3=A, 4=C/M. Scratch a horse to recalculate win probabilities for remaining field. Unscratch to restore.