I tend to agree with stuzzicadenti. In my opinion, there is not such a thing as "the best of all times" in any kind of human activity.
Fischer was the best for some time, than Karpov, followed by Kasparov. Today Carsel (??) is the #1. In the past, Petrosian, Alekhine, Capablanca, and others had their reign.
Also, I think it is not possible or fair to compare one of these great chessplayers with anyother that live in a different span of time. Life today is, eg, completely different from the Alekhine´s time. Resorurces are others, competitive chessplayers also.
There is a "best" chessplayer for each moment in time.
Saludos.
I disagree , sorta . Usain Bolt is currently the fastest man of all time in 100m sprint and 200m . It would be more accurate to say he is the fastest sprinter to date because in the future someone will probably break his records as well .
After winning the WC Fischer had gotten so paranoid, he was afraid the KGB wanted to kill him. Therefore the hiding and almost no one knew where he lived, he had broken with most of his friends. In those days it was not so hard to do. These days I doubt it.