Which loss had a player lower than 18?
CREATE TABLE "torneo_clausura_closing_tournament" (
  "team" text,
  "points" real,
  "played" real,
  "drawn" real,
  "lost" real,
  "against" real,
  "diff" real
);
SELECT MIN("lost") FROM "torneo_clausura_closing_tournament" WHERE "played"<18;