What year at the US Open Cup quarterfinals, were the playoffs in the semifinals for the USL second division?
CREATE TABLE "year_by_year" (
  "year" real,
  "division" real,
  "league" text,
  "regular_season" text,
  "playoffs" text,
  "u_s_open_cup" text,
  "avg_attendance" real
);
SELECT "year" FROM "year_by_year" WHERE "league"='USL Second Division' AND "playoffs"='Semifinals' AND "u_s_open_cup"='Quarterfinals';