Lack, check players called chico_001 and holyunity.
They only play doubles together... their turns are of a incredible proximity, and as a double their win rate is... suspicious. Chico (called "cheatco" by opponents in some games, like 3396) was a loser, but holyunity changed that in the doubles... very, very suspicious. It seems to be a guy bored with sequential losses, and your "imaginary friend".
I dont know if Im right, but check it, please.
Ps: they cant say I am saying this because i lost to them.