On what date did the first match occur for the competition that ended with a final position of winners and the final round in the finals?
CREATE TABLE "overall" (
  "competition" text,
  "started_round" text,
  "final_position" text,
  "final_round" text,
  "first_match" text,
  "last_match" text
);
SELECT "first_match" FROM "overall" WHERE "final_position"='winners' AND "final_round"='finals';