If you have gone through Account>Privacy>Unblock, then I believe the task is done. They are unblocked from Live Chess as well.
What do you mean you cannot 'get' that person? Maybe they were just not online. If you want to see whether the method has really worked, you should go to their profile, and if you are able to type in a note, it means they are not blocked by you.
Hello,
I am playing live chess and I want to unblock someone but i still cannot get that person.I already unblock from the Account>Privacy>Unblock(name).Any answers will be appreciated.