What was the result in 1973 when the surface was clay?
CREATE TABLE "women_s_doubles_10_4_titles_6_runner_ups" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "outcome" FROM "women_s_doubles_10_4_titles_6_runner_ups" WHERE "year"=1973 AND "surface"='clay';