here is the data based on horses backing up more than 1 pt in the race prior to the derby:
yr, # of horses, finished in the money
2011, 4, 0
2010, 4, 0
2009, 4, 0
2008, 5, 1, denis of cork 3rd
2007, 4, 0
2006, 7, 1, bluegrass cat 2nd
2005, 1, 0
2004, 5, 2, smarty jones 1st, imperialism 3rd
2003, 3, 0
2002, 3, 0
2001, 4, 1, monarchos 1st
2000, 3, 0
1999, 4, 0
1998, 3, 0
1997, 1, 0
Is this data useful at all in looking at how to play the derby. it seems the horse has to be coming in on his best to win. this would knock out 4 of the top 9 including a couple recently discussed by many.