What do you mean by "Impersonate"?
Impersonate

Someone is a mature man but in chess.com member he is the young pretty woman.. He acts as a girl..and attract many members at his groups..

You can't prove anything on the internet. It's just your word against his.
And so what if he assumes a different persona on the internet?

he is my friend. but my another friend open his real name and real photos. they ever met at chess party at chess.com members at their city.

i think so..but many friends shocked..95% chess player in my country are male..and many of them have intensive chatt (whith him)..n some have appointment to meet(date maybe)..

They should think the consequences of flirting online before they decide to do it. You DON'T really know who you are speaking to.

agree.. anybody could be anyone..if someone publish his real identity do you think it's the right or wrong?

IMO
It's up to you to use your real name or a nickname. And you should always be given both options in every website. You can even choose to have an avatar (or not), provided that it is not improper in any way.

i mean its right or wrong if you publish someone that he isn't his real identity (as a young beautiful girl) cause you knew his real name and real photo.. I'm sorry if my English not good

i mean its right or wrong if you publish someone that he isn't his real identity (as a young beautiful girl) cause you knew his real name and real photo.. I'm sorry if my English not good
You keep thinking about this matter as if it was something very important. You seem to have a sense of responsibility about saving the community from a faker. Let him fake and live your own life. Did you ever think about the consequences of revealing his real identity? Is it possible that he may become mad or even hostile against you?

Well, if you wonder I'm a guy.
I just found the picture fine...
I swear I'm not really a manga character !
I'm gonna make it clear on my profile
=D
If i know that someone impersonate, what can i do? Is it okay if publish it ?