6-0, 6-0 is no speculation.
Just a fact.
One which no one else has ever come close to.
I mean it is speculative because we can't prove he could have beaten Carlsen had he been born at the same time or even giving him a few years head start. Babe Ruth being the greatest of all time as a baseball player is speculative, he dominated weaker competition. Most people believe if he were born today he would still be the best assuming he incorporated modern training techniques, but we can't know for sure. That's all I meant. And Goat also depends on whether you prefer consistency or peak. If it is consistency Kasparov is clearly the answer, but I assume most will find that a dull answer. Morphy destroyed everyone, unfortunately for him he didn't have a worthy opponent. He may have been more talented than Fischer but obviously would have needed to learn some modern theory. All speculative, but fun to consider.
Savage47, Fischer was world champion for only four years. I don't think that's enough time to say he's the goat. If he had continued that level of dominance for 10+ years, I'd agree. However, he quit early, so we'll never know if he was the goat or an anomaly. That's why I would give the edge to Kasparov. He proved that he could dominate for 20 years. Fischer proved that he was an amazingly good player prone to rage quits.
he was only world champion for one year.