My previous post, More World Championship Hubbub, had a couple of links to reviews about the full length documentary (78 minutes) by Benjamin Ree. Here's a trailer for the film.
Magnus Official Trailer 1 (2016) - Documentary (2:10) 'Directed by: Benjamin Ree. From child prodigy to chess genius.'
And here are a couple of links to two of the web's most indispensable movie sites.
Rotten Tomatoes currently has 13 professional reviews, 11 of them positive. Although there are no audience reviews, the two on IMDb both give it six stars out of ten.
One of the comments on the original Youtube page said, 'He looks like the twins from Teen Wolf.'
Source: Ethan and Aiden | Teen Wolf Wiki
For more Magnus lookalikes, see Magnus Looks Like That Guy? (December 2013).