I recently played a game of chess against Dr3nt, and lost pretty hard.. but I was suspicious of his/her play and analyzed the game with an engine. Sure enough, all moves he/she played were the engine's first or second choice. I think it is pretty obvious that this person is cheating..
This is the link to the game: https://boardgamearena.com/table?table=103865621
Can something be done about this?