I don't know, but would imagine, that in that era, there were a few cities, such as Paris and London, where a serious chess player would need to go to compete.
I would also imagine that players back then also had a more distinctly unique style, as sharing ideas was not as easy.
I was reading up on the history of Paul Morphy, who at 9 years old was already beating professional chess players.
I began to wonder, without computers, so few books, and low communications (so hard to find good players to play)---how did these masters before the year 1900, ever become such genius players?
Were they all geniuses? Did they all have powerful teachers ? Did they simply obsess over the board and play themselves and develop theories? Did they have a lot of pre-1900 expert chess books?
Even further, how did those world champions before the 1700s ever get so good?
Are we just a dumber generation that with all the books, tactics trainers, computers, and unlimited amount of opponents--that some of us can't even get past 1700?