what's the most recent year that samantha stosur was the opponent with 20 aces and having played more than 2 sets?
CREATE TABLE "women" (
  "aces" real,
  "player" text,
  "opponent" text,
  "year" real,
  "event" text,
  "sets" real,
  "result" text
);
SELECT MAX("year") FROM "women" WHERE "aces"=20 AND "opponent"='samantha stosur' AND "sets">2;