Petya Polevayev

Named only as a point of comic comparison -- a gold-mine owner who dined in Chekhov's cabin is said to have "the face of Petya Polevayev" -- not independently identified against a public-domain source and not otherwise attested in this corpus; likely a private acquaintance or family-circle reference recognizable to the letter's addressees but not resolvable at this remove. No identification is asserted.