This is like trying to determine the number of angels that can dance on the head of a pin 
Best Chess Player Ever?
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Right then, let's settle this once and for all. You find some angels, and I'll find a pin...
We may be seeing Magnus being a future great I mean seventeen and leading the fide live ratings!! sure he's not there yet but who knows lets enjoy the present we could be watching the rookie season of Michael Jordan. but I would say Kasparov and fischer because of what they did compared to the world. Fischer to be that good without an establishment wow. and how dominant he was leading up to the Championship in 72? also Kasparov highest 2 year 5 year 10 year and 15 year performance on chess metrics? (maybe even twenty year I haven't looked in awhile.
It must be the one who invented Chess. :)