What was the surface on the game with margit rüütel anett schutting as the opponent?
CREATE TABLE "fed_cup_doubles_performances_10" (
  "edition" real,
  "zone" text,
  "round" text,
  "date" text,
  "against" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "result" text
);
SELECT "surface" FROM "fed_cup_doubles_performances_10" WHERE "opponents"='margit rüütel anett schutting';