What opponent had a game with more than 50,705 in attendace on September 13, 1982?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "game_site" text,
  "attendance" real
);
SELECT "opponent" FROM "schedule" WHERE "attendance">'50,705' AND "date"='september 13, 1982';