Which runner(s)-up had a Winning score of –13 (68-70-66-71=275) and a Margin of victory of 3 strokes?
CREATE TABLE "pga_tour_wins_13" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "runner_s_up" FROM "pga_tour_wins_13" WHERE "margin_of_victory"='3 strokes' AND "winning_score"='–13 (68-70-66-71=275)';