CREATE TABLE table_33231 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What home team played the away team of Richmond?
SELECT "Home team" FROM table_33231 WHERE "Away team" = 'richmond'
SELECT "Home team" FROM "table_33231" WHERE "Away team" = 'richmond'