What is the date of the game against Chelsea when the league position is 14th?
CREATE TABLE "match_details" (
  "date" text,
  "league_position" text,
  "opponents" text,
  "venue" text,
  "result" text,
  "score_f_a" text,
  "attendance" real
);
SELECT "date" FROM "match_details" WHERE "opponents"='chelsea' AND "league_position"='14th';