Who played Richmond at home?
CREATE TABLE "round_22" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "crowd" real,
  "date" text,
  "report" text
);
SELECT "home_team" FROM "round_22" WHERE "away_team"='Richmond';