One handicapping tool I've found somewhat useful is trainers' comments, as published in articles in the DRF and also on many tracks' websites, concerning their entrants' chances going into a race. For example, before the Las Virgenes, Baffert said something like, "We haven't been working her [Habibti] too hard because she lost weight since her last and hasn't been able to put any weight back on". These comments are most useful when trying to gage a horse's fitness coming off a layoff. Often I'll read things like, "We wanted to start him in a X distance or Y class race, but there was nothing available, and we had to start somewhere."