MIAMI - Grass horses are supposed to hold their form better than their main-track counterparts, but you'd never prove that theory by using the local turf handicap division as an example. The unpredictable group will gather again at Calder on Saturday for the $40,000 Absent Russian Stakes, with any of at least a half-dozen members of the 12-horse field likely to come away with a victory in the 1 1/8-mile overnight event.