What is Date, when Winning Score is −14 (68-68-67-71=274)?
CREATE TABLE "pga_tour_wins_9" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "date" FROM "pga_tour_wins_9" WHERE "winning_score"='−14 (68-68-67-71=274)';