There were not professional chess players, just hobbyists at best. Don't know if they had a ranking. You can watch the full thing here
. The guests are introduced at 2:22. He calls mate on next move at 20:05.
If you want to see the Rubik's Cube GOAT, Feliks Zemdegs is your guy
It'll just make me mad for not being able to do the same but okay
That's the thing with chess. Guys who can see so far ahead, and have such a clear visual picture of the board do so well. I guess, the top players mostly have that skill plus an internal knowlegde of chess play in general. Makes me sick.
When someone asks me if I'm good at chess I can never say yes because there are so many strata of skill level. Also, I'm pretty mediocre.