At the VFL Reserves, who was the opponent when the score was 18.6 (114) - 21.14 (140)?
CREATE TABLE "reserves_team" (
  "year" text,
  "competition" text,
  "opponent" text,
  "score" text,
  "venue" text
);
SELECT "opponent" FROM "reserves_team" WHERE "competition"='vfl reserves' AND "score"='18.6 (114) - 21.14 (140)';