Each player is only allowed one account. There is a IP checker built into the game. For more info on this contact UR via their contact email.
I played with 2 accounts at once loads of times
We allow 2 accounts on same ip (because honest peoples might be using that: home-lan, work-lan, proxy) BUT we'll reduce earnings if too many matchs between the same ip in a short lapse of time, but the rule of
the site is one account per person. If someone don't follow this agreement, it may face accounts removals from us (especially on accounts abuses, bad behivor, cheating, con etc..).