Tell me the lowest date for result of win and method of points with notes of opening round
CREATE TABLE "submission_grappling_record" (
  "result" text,
  "opponent" text,
  "method" text,
  "event" text,
  "date" real,
  "notes" text
);
SELECT MIN("date") FROM "submission_grappling_record" WHERE "result"='win' AND "method"='points' AND "notes"='opening round';