Which Winning score has a Margin of victory of 1 stroke, and a Date of 21 jun 1981?
CREATE TABLE "european_tour_wins_8" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "winning_score" FROM "european_tour_wins_8" WHERE "margin_of_victory"='1 stroke' AND "date"='21 jun 1981';