What was the result of the event on 20 September 2008, held at the Firhill venue, at which more than 3,303 were in attendance?
CREATE TABLE "2008_09_partick_thistle_f_c_season" (
  "date" text,
  "opponent" text,
  "venue" text,
  "result" text,
  "attendance" real
);
SELECT "result" FROM "2008_09_partick_thistle_f_c_season" WHERE "attendance">'3,303' AND "venue"='firhill' AND "date"='20 september 2008';