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It's no need to blacklist Optimus, since he has dynamic ip. I gave him admin some time ago, because he seems intelligent, speaks english enough, was helping with gema killers, and allowed me to communicate with brazilian community.
I had some doubts about him cheating, because of some records he made (anyone beating me is a cheater :p), but I had no proof. Thank you for your help Mayhem, I will remove his admin.