When was the winning score −6 (69-69-73-71=282)?
CREATE TABLE "lpga_tour_wins_8" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "date" FROM "lpga_tour_wins_8" WHERE "winning_score"='−6 (69-69-73-71=282)';