What is Score, when Visitor is "Pittsburgh", and when Points is greater than 18?
CREATE TABLE "game_log" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "attendance" real,
  "record" text,
  "points" real
);
SELECT "score" FROM "game_log" WHERE "visitor"='pittsburgh' AND "points">18;