How to deal with advanced bully on the forum?

Moderators monitor and delete his messages without joining in the discussion. Soon he is tired and he'll filter himself. Cheap and cheerful.

Try to remember the villain with the aid of samy.pl/evercookie/.

If there is how to calculate the man — make his posts visible only to him. Very soon he'll think his trolling and bullying no one responds and just leave the forum

Will offer its own version, combined.
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The posts of new users only see a tech support. While the user will not gain, say, 10 comments or is there 1-2 a topic, his posts no one but himself and modders-Tekhov sees. At this stage, quarantine often it is possible to determine the diagnosis.
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If the patient thinks that he is suddenly allowed to spoil, and here it is free, it's good — let rejoices still no one sees him.
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If you understand what's going on, that's okay too — you are greatly harming his life, forcing him to increase the complexity of raids. He will either have to spend a lot of time on mimicry under normal person, or significantly change tactics.

Don't ban him, give him the opportunity to quietly write whatever he wants from your account.
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Write a script that automatic rubs his posts every hour, for example. It will not create a new ACCA because "this is not banned", and will think that his message tinder modernizing. You can make the script randomly once in a while, like every 1-2-3 hours from 9 am to 21 PM.
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If he gets wind of this and will create another ACC, just add the new ID to the script. Sooner or later the user will get bored of spamming =)

Try to make friends with him)

Pre-moderation for new users, for example the first 3 posts. What is the engine forum?