I did manage to finish 5th place in the Masters 40+ race. I had held onto 4th place for much of the race but was overtaken right before the finish line. I believe that I can pedal better than that guy, but he is an experienced 'crosser and most of the obstacles came at the end of each lap, so he stalked me until the course favored him - it was a good tactic.
For you data geeks, here are my Heart Rate and Altimeter graphs from the last three cyclocross races. Bear in mind that I have not raced in over a year previous to these events and my AT is not nearly what it was before the illness and injuries.