How many times was there a kickoff in the September 4, 1988 game? 
CREATE TABLE "schedule" (
  "week" text,
  "date" text,
  "opponent" text,
  "result" text,
  "kickoff_a" text,
  "game_site" text,
  "tv" text,
  "attendance" text,
  "record" text
);
SELECT COUNT("kickoff_a") FROM "schedule" WHERE "date"='September 4, 1988';