Table schema:
CREATE TABLE table_1939202_2 (year VARCHAR, us_open_cup VARCHAR, league VARCHAR, playoffs VARCHAR)

Question: What year at the US Open Cup quarterfinals, were the playoffs in the semifinals for the USL second division?
SQL: SELECT year FROM table_1939202_2 WHERE league = "USL Second division" AND playoffs = "Semifinals" AND us_open_cup = "Quarterfinals"