Who is the greatest chess player of all time ?? Bobby Fischer ??

Again, you're not reading what Sonas himself wrote. He actually ranked the players according to his rating system. 

Jeff Sonas really does believe that Tarrasch was better than Topalov. Yes, he bases it on performance, and yes he does say that at some point a more accurate rating system may come along, but he argued that his formulae were more accurate than Elo ratings for determining relative playing strength. 

Obviously, Kenneth Regan, FIDE, and others (including myself) disagree with Sonas.

"the numbers represent the relative degree to which individuals dominated their own time, rather than making any claims about whose chess was objectively stronger"

http://en.chessbase.com/post/the-greatest-che-player-of-all-time-part-i

Flip side of course is that an argument can easily be made that modern GMs are standing on the shoulders of giants like Capablanca, Fischer & Morphy....

If you are actually from Nauru, shouldn't you be sweeping the ocean floor for manganese nodules or something?

Elasped time.  I don't know how much actual effort could have gone into it, but if Karpov could have easily proved it when 2700chess.com first started posting their all-time highwater ratings marks, I'm sure he would have.

I like karpovs clean style and I do not think kasparov  would never have gotten  so good if he had not played karpov so many  times i.e. kasparov did not base his sacrifices on principles (as much) before 1984

also it's important to note fischer was scared of karpov and kasparov xD

Citation?

It's like saying Issac Newton's scientific understanding paled in comparison to Einstein's.  Hell, Einstein proved him wrong.

Newton's Theorems are wrong?

They are fantastic approximations.  Relativity is better.

Calculus is still rock-solid.

Einstein did not prove newton wrong he just made a differant model.

Fischer played a boring brand of chess that proved only effective against technically inferior players to himself.

Even in his prime I think he would have had considerable trouble with players consequently looking to create complications be it in a tactical or positional sense. In this way I think he wouldn't have fared as well against many strong players as one thinks he would. The players he did dominate in his era weren't particulary strong. The more critical ones he either didn't face that often or had even or negative scores against. 

IMO nowhere near the greatest. 

I did not use to think so either but after kasparov said so many good things about fischer I went and took a real hard look at his games he may have been. But it is ironic he actually said petrosian was.the best and his favorite. But I think bobby was. I have a chess master program I use to practice on. So one day I played the gm section. First game I drew petrosian it said I was world ruler 2731 rating. So I see fischer in that list he butchers me -192 rating points. I bounch back and beat leko. Now chessmaster plays exactly like these deceased gms. Based on what I saw last summer doing this I think bobby is miles above those guys.

If you read Kasparov's books, you will get the impression that all of the world champions with the possible exception of Capa was the greatest ever. He's very complimentary to all of his predecessors.

Newtonian physics was superceded because while it is incredibly accurate at velocities much, much lower than the speed of light, it falls apart at extremely high velocities.  Einstein's relativistic physics addresses this and works across all velocities.

Eventually relativistic physics will likely be superceded as well in order to reconcile it against inconsistencies with what happens at the quantum scale.

This game (and this tournament) show us that Nakamura is up here, on Fisherlevel,

https://www.youtube.com/watch?v=CK-AjbDv0O8

but Nakamura probably isnt on Magnuslevel yet, or maybe he got there now?

Yes!!!!!! Fischer!!!!!

1+2 Carlsen and Kasparov...random order

3+4 Capablanca and Fischer...random order

I believe Gary Kasparov was the best.