Yeah. I love history.
Who is the greatest chess player of all time ?? Bobby Fischer ??

In my opinion, chess has developed so much, which makes players hard to compare. Since the game is always shifting and changing, a GM 100 years ago, maybe wouldn't be a GM now, or a non GM in the 1800s could be the world champion now. Somebody could argue Philidor is, but he may not even be a GM today. However, taking this into account I would vouch for steinitz, he had the best understanding of chess principles and fundamentals, his play is timeless.
would car or formula driver from 30s kbe champion today? no if use his 30s car, but if he use nowdays car...
same goes form grandmasters, if Capa or Bobby live today, they would use todays technologies and knowledges...

Yeah, Fischer helped to usher in the professional age of chess. It's certainly a point in his favor. But if you are counting such things, then his resignation of the title without playing a single game would also have to be counted. He's the only World Champion who didn't defend his title.
Alekhine didn't defend his title the last time, but he had a good excuse.
Not counting his matches with Karpov (fixed in Fischer's oppinion), Kasparov broke with FIDE in 1993 (as Fischer did earlier) and played with Short (also expelled from FIDE). Then Kasparov won another match outside FIDE against young Anand. And in 2000 he lost to Kramnik (although Shirov qualified by winning the match with Kramnik) . And finaly, Kasparov refused to play in the 2002 Dortmund Candidates Tournament, claiming he should play World Title rematch with Kramnik. For trivia, Kasparov played a match in Dec. 2002 with Karpov and lost. In 2005 Kasparov anounced his retirement from chess.
So, from a FIDE standpoint, Kasparov never (succesfully) defended his title.
Not counting his matches with Karpov (fixed in Fischer's oppinion), Kasparov broke with FIDE in 1993 ... So, from a FIDE standpoint, Kasparov never (succesfully) defended his title.
I do not remember ever hearing of FIDE adopting the Fischer opinion.

Not counting his matches with Karpov (fixed in Fischer's oppinion), Kasparov broke with FIDE in 1993 ... So, from a FIDE standpoint, Kasparov never (succesfully) defended his title.
I do not remember ever hearing of FIDE adopting the Fischer opinion.
Which part of "Not counting..." you didn't understand?
Not counting his matches with Karpov (fixed in Fischer's oppinion), Kasparov broke with FIDE in 1993 ... So, from a FIDE standpoint, Kasparov never (succesfully) defended his title.
I do not remember ever hearing of FIDE adopting the Fischer opinion.
Which part of "Not counting..." you didn't understand?
"Not counting" was not in the "FIDE standpoint" sentence.
Not counting his matches with Karpov (fixed in Fischer's oppinion), Kasparov broke with FIDE in 1993 ... So, from a FIDE standpoint, Kasparov never (succesfully) defended his title.
I do not remember ever hearing of FIDE adopting the Fischer opinion.
Which part of "Not counting..." you didn't understand?
An opinion. Now lets go to the facts, Kasparov defended his FIDE world championship against Karpov.
Yeah, Fischer helped to usher in the professional age of chess. It's certainly a point in his favor. But if you are counting such things, then his resignation of the title without playing a single game would also have to be counted. He's the only World Champion who didn't defend his title.
Alekhine didn't defend his title the last time, but he had a good excuse.
That was influential too. Here you are talking about it 45years later.