How many times has the score been 6–4, 3–6, [11–13]?
CREATE TABLE "doubles_43_26_17" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "partner" text,
  "opponent" text,
  "score" text
);
SELECT COUNT("opponent") FROM "doubles_43_26_17" WHERE "score"='6–4, 3–6, [11–13]';