Yeah, thanks for nothing. I looked at the release dates and followed the lines carefully. It would seem you are correct. Chainmail was released around four years before D&D. Point made. Now back to my point.
However, I wana say quit being a jerk. Why did you even molest me with irrelevant info? How bout you get a clue, huh? I was talking about the rule system not the role playing in general. If you still don't have a clue as to what I'm talking about here is a direct qoute from my source.
That taken from http://www.acaeum.com/DDIndexes/SetPages/Chainmail.html
Therefore, D&D is the root of the D20 system. :D