Thanks for your thoughts you guys. :) I'm new here and unfamilar to this web still.
TTennisfan, you are right. He changes his profile and ELO very often, as to appear either rather low-skilled or the master. Also, sometimes he changes his ELO points and everything (including name) as to match his opponent (in this case is me "Emperor Young").
Manutoo (sorry, I spell your name wrong last time), this impersonating man is really freaking me out. (He might be reading this too cuz he said he uses this forum a lot) I don't know, but in the past few times, he joined my game around 10 pm to 12 am (USA Central Time), using my name and my ELO (about 1800). But, since he modified his ELO to match mine, when I play him in the game, his real ELO drop to 1000. I hope this helps.