What is the round 6+ that has a from prior to 1993, double for round 3, and a double for round 5?
CREATE TABLE "scoring_format" (
  "from" real,
  "goal" real,
  "round_1" text,
  "round_2" text,
  "round_3" text,
  "round_4" text,
  "round_5" text,
  "round_6" text
);
SELECT "round_6" FROM "scoring_format" WHERE "from"<1993 AND "round_3"='double' AND "round_5"='double';