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Dan says
Chekhov is Modern (an era that has been over for quite some time now), not contemporary. 1950 would be the oldest I'd call contemporary, and probably even that's too old.
Emms says
This is tough, cause different schools see this different ways. Chekhov certainly isn't "contemporary," I don't think, but he is "modern." I've heard so many different views on this–that contemporary starts in the 1850s, the 1920s, or the 1950s. You should find out about the schools specifically.