CREATE TABLE table_57673 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was Richmond's away team opponent?
SELECT "Away team score" FROM table_57673 WHERE "Home team" = 'richmond'
SELECT "Away team score" FROM "table_57673" WHERE "Home team" = 'richmond'