In what tournament was the winning score 68-67-65-66=266?
CREATE TABLE "table1_1615980_4" (
  "no" real,
  "date" text,
  "tournament" text,
  "winning_score" text,
  "to_par" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "tournament" FROM "table1_1615980_4" WHERE "winning_score"='68-67-65-66=266';