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To be a character in a Chekhov drama is often to be tantalized and tormented by the life unlived and by the knowledge that although you’re engaged in a game with mortal stakes, you’re unsure what hand to play.
That awareness of a trapped-in-amber existence creates an atmosphere of gradually intensifying desperation in “The Seagull,’’ now at Harbor Stage Company. Adapted and directed by Robert Kropf, it’s a stiletto-sharp production that marks another milestone for this indispensable young troupe, founded last summer by a handful of actors at the tiny waterfront stage that for decades had been operated by Wellfleet Harbor Actors Theater.