I spoke to Boris Spassky about this same issue and he believes that Bobby would have won in 1975, but that Anatoly would have won the rematch.
However, Garry Kasparov has a different viewpoint. He believes that Anatoly would have won in 1975 and supports this opinion by demonstrating the quality of their games at that time. This is what that makes chess so interesting. From all of the people I spoke to, the opinions split right down the middle with a small edge for Bobby.
I think it would have been very close. However, Bobby would have had a small edge due to his greater experience at that time.
Just one of those ‘what-if’ questions that will obviously solicit differing opinions from different people. Apparently, we can’t hold on to the past anymore. Thus, the more relevant question now is: Who will win this year’s world championship?
Remember that super game by GM Wesley So? This is how it unfolded.
Watch how the Round 10 unfolded between Wesley So and Garry Kasparov of the US Ultimate Blitz Challenge 2016. After Wesley So smothered him in this blitz game, perhaps out of frustration or embarrassment (who knows?) — Garry Kasparov walked out immediately of the playing hall. Check out also how the commentators described how astonishing Wesley was playing in this game.
The last day of the challenge has finished, and Hikaru Nakamura came out to be the overall winner, followed by Wesley So with a full point behind. Garry Kasparov retained his 3rd rank from Day 1, and so did Fabiano Caruana, the champion of the US Chess Championship 2016, his tailender.
Wesley So’s round 10 win over Garry Kasparov was hailed by commentators as “one of the finest attacking game since Morphy!”. Here’s the game:
Wesley So lost his very first game in this tournament/challenge against the legendary Garry Kasparov, but he managed to get back at the latter in their next two matchups (thus, their score so far is 2-1 in favor of So). He even come out ahead of the pack at the end of the day. He who scored 5.0 out of 9 games — tied with Hikaru Nakamura in points but leads after the tie-break was applied.
In round seven Magnus Carlsen played against Vladimir Kramnik, one of his predecessors as World Champion. Carlsen seemed well prepared and won a fine strategic game in which he exploited Black’s weak square f5 in textbook fashion. Levon Aronian used his space advantage to harass Black’s king and to win with a mating attack. The three other games were drawn.
With the way Carlsen is playing outstanding chess in recent months, I wonder if he gets to break the 2900 ELO rating barrier anytime soon?