Chekhov plays all have certain themes and elements in common: love of work, unrequited love, suffering, aging, adultery, the etiquette of dealing with servants, educated people bored by the banalities of their circumstance. Three Sisters has all of that, and as fine a production as just opened at Berkeley Rep also brings with it a heap of pathos, and some emotionally charged, interlocking layers of interpersonal dynamics among a varied cast of characters, ranging in age from about 22 to 82. It's a fantastic play that deserves a nuanced production, and director Les Waters, a Berkeley Rep staple, and a terrific cast give it just that — with the not inconsiderable help of a new version of the play by Sarah Ruhl (of The Vibrator Play fame).