Most Powerful Handicapping Angles

[Travis Stone]

I'm refreshing the beginners handicapping course I teach at the local community college. Last year we spent one night talking about various handicapping angles, both good and bad. I wanted to toss the question out to DTers so I can maybe toss a few more angles in here or there to the course and keep it somewhat new to the regular attendees.

So if you wouldn't mind, what would you consider to be the most powerful (both positive and negative) angles in handicapping?

For what it's worth, here's what I would put:

1. Distance cut-back
2. Second-time starter off even debut
3. O2X (From the Sheet guys)