What Score has a Place of t6, a Country of united states, and a Player of fred couples?
CREATE TABLE "second_round" (
  "place" text,
  "player" text,
  "country" text,
  "score" text,
  "to_par" text
);
SELECT "score" FROM "second_round" WHERE "place"='t6' AND "country"='united states' AND "player"='fred couples';