What was the date of the Ace Group Classic tournament with a 1 stroke margin of victory?
CREATE TABLE "champions_tour_wins_9" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "date" FROM "champions_tour_wins_9" WHERE "margin_of_victory"='1 stroke' AND "tournament"='the ace group classic';