Thank you for bringing up this topic. Many like to rightfully think we have all kinds of advantages over past chess players, ie; more accurate openings as a result of more games being hotly contested and run thru computer analysis, as well as more definite facts about all kinds of positions, including gambits and endings that have been churned thru computer analysis and tested against the highest grandmasters in practice.
I disagree when you said at end "And getting today's GM's off the books early on would give him a good advantage." Fischer was known for studying in detail certain openings and springing them on opponents, ie; Exchange variation of the Ruy Lopez. That after losing to Fischer in what had been considered a decent line, now all of a sudden people were thinking were untenable ! So, rather than get topnotch players out of their opening book early, I believe Fischer would hunker down and study all recent top level games and find flaws or sharp variations to spring on his opponents. That is more his style. He was a firm believer in his own resources and powers of innovation. He would gladly enter positions that had chances for both sides, ie; poison pawn variation of the Najdorf Sicilian. Who in today's world would engage Fischer in such combat ?
I recently came across a collection of Fischer quotes that was compiled into an article in the first issue of Chessworld magazine. It covers "the ten greatest masters in history", detailing Fischer's thoughts on each of them. But what really struck me was his comment on Paul Morphy:
A popularly held theory about Paul Morphy is that if he returned to the chess world today and played our best contemporary players, he would come out the loser. Nothing is further from the truth. In a set match, Morphy would beat anybody alive today.
He goes on to talk about Morphy being the best-read player of his time. He believes Morphy to perhaps be the most accurate player who ever lived. He made moves in minutes without blundering, while his opponents would often take hours.
In a way, it almost feels as if Fischer is talking about himself. We discuss Fischer a lot in these forums and quite often it comes down to him vs modern players. As Naka said, "Fischer would most certainly lose to all of us". It would seem Fischer held his predecessors in much higher regard than Naka does. But Fischer himself believed the past still had a fighting chance with the future. I think it's safe to say that no one has ever been as obsessed with chess as Fischer was. And thankfully his obsession lent him true ingenuity. His own praise of Morphy's ingenuity seems to have reflected heavily on his game.
Anyway I thought it would be interesting to let the grandmaster weigh in on his own strength as a chess player in modern times. If a 29-year-old Fischer were here, I think he'd say he had a fighting chance of taking down the chess greats of today. After all, he, like Morphy, was inventive. And getting today's GM's off the books early on would give him a good advantage.
And here's the article if anyone wants to read through it: http://www.chesshistory.com/winter/extra/fischer4.html