I think it's Magnus Carlsen. I mean he's amazng
Best Chess Player

In the universe? Some form of ultra intelligent foreign life I assume, we would have to teach them/it chess first though ;)
I'm guessing black's previous move was ...Qd1. So did white miss it or got lost in his calculations and forgot to play Bxe6 first?
The best chess player WHOEVER EXISTED? Fischer said, It is him! Now go argue with him not with me here or others.

Sources seem to indicate that the decisive mistake was a move or two before that, when he allowed ...Qd1 to be strong. Indeed, Anand is an aging player.
The best chess player WHOEVER EXISTED? Fischer said, It is him! Now go argue with him not with me here or others.
"Morphy was probably the greatest genius of them all."
-Bobby Fischer
I am not overlooking the possibility that Fischer meant Morphy was a lesser player but a greater genius...
Who do you think is the best chess player in the universe?