Untold: Chess Mates

Niemann might have been a pretty unbearable teenager, and not so likeable twenty-two year old, but this documentary does make it fairly clear that Carlsen was a sore loser who used his influence to make accusations without evidence with the hope of having this human being removed from his life. Which is very poor behaviour for a world champion. Pretty much everyone comes out looking bad. It's a virtue of the filmmakers that they seem to have been able to remain aloof from that influence.