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I saw this guy with his real time kill-death ratio as his motto. I asked him about it and he said he would send it to me but I never got it. Does anyone else know about this and could direct me where to find it?

I wouldn't know purely about the kill-death ratio being displayed, but there is something called an ELO rating. Check the hyperlinked thread for more details and do share if that's the thing you were thinking about and looking for or not.