Which literary technique was introduced by Chekhov and changed the rationale for literature in the modern era?

Protagonists who has qualities of a hero

Explanation:

Anton Chekhov is a Russian writer who is recognized as a master of modern short story. He introduced a new approach of writing story plot with the introduction of protagonists who has qualities of a hero,he created characters that are more human and realistic. This change in plot was totally different from the traditional view of a protagonists who has villains attributes who seem inanimate.

A protagonist who has qualities of a hero

Explanation: A protagonist can be described as the chief act or one who leads or champions a particular cause.

However, being a protagonist doesn't translate into being a hero as heroes are often those who champion a cause with selflessness, ingenuity, strength and sound judgement.

Anton Chekhov, a Russian playwright introduced a technique which incorporated both, being a protagonist as well as heroic, that being the main character as well as possessing extraordinary qualities while changed the rationale for literature writing in the modern Era.

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"it's more of an essay than story, but perhaps it is best described as a mood-piece: it uses a lot of musical imagery, not to mention sea imagery, religious imagery, and any other imagery that suits his purpose."