I'd like to get back into theoretical physics as a retiree. I last worked on the relativistic 2-body problem over 25 years ago. I've been reading Trump and Schieve's text on classical relativistic dynamics and I'm wondering has the classical 2-body relativistic problem been solved. I realize the word "solved" has different meanings for different people. I'd like to hear your comments on the status of this problem. Perhaps you can suggest a more recent text than this one.