What was the score when Nacional was the champion, River Plate was the runner-up, and the venue was Centenario?
CREATE TABLE "finals" (
  "year" real,
  "champion" text,
  "runner_up" text,
  "score" text,
  "city" text,
  "venue" text
);
SELECT "score" FROM "finals" WHERE "champion"='nacional' AND "venue"='centenario' AND "runner_up"='river plate';