What is the highest round with a guard position and an overall greater than 71?
CREATE TABLE "atlanta_falcons_draft_history" (
  "round" real,
  "pick_num" real,
  "overall" real,
  "name" text,
  "position" text
);
SELECT MAX("round") FROM "atlanta_falcons_draft_history" WHERE "position"='guard' AND "overall">71;