An interesting chess column in The Columbus Dispatch by Shelby Lyman. Read on:
At the other extreme were players such as Fischer, Efim Geller and Viktor Korchnoi: harbingers of a more radical work ethic to come, laboring with little respite at the chess grindstone. Mikhail Botvinnik set a new standard for preparation and performance.
But it was the young American, Fischer, who raised the professional banner and chess work ethic to its highest level. As he explained to fellow grandmaster Larry Evans, Fischer focused on the game, consciously or unconsciously, 24 hours a day.
The previous bohemian approach to chess is no longer workable. This is, as some older grandmasters wistfully and woefully explain, largely both the contribution and the curse of Robert James Fischer. (Shelby Lyman is a Basic Chess Features columnist.)