Old English has worked for me in the past, but only on darker woods - otherwise the scratches seem to be somewhat accentuated by the dark color of the oil. Howard makes a product called Restor-a-Finish that I use much more often now. It comes in nearly a dozen different shades for wood matching. It can be used on the entire piece, and (when matched fairly closely to the wood) covers scratches and dings wonderfully. They disappear.
It is specifically mentioned in several reference books I own concerning furniture restoration, as the first (and least invasive) method of repair that should be attempted. It won't help if it is in fact paint that you have discovered on the chair, but I thought I would throw it out there anyway.
Good luck!