Who was the opponent for a game over 31 and a date over 30?
CREATE TABLE "game_log" (
  "game" real,
  "date" real,
  "opponent" text,
  "score" text,
  "decision" text,
  "location_attendance" text,
  "record" text
);
SELECT "opponent" FROM "game_log" WHERE "game">31 AND "date">30;