CREATE TABLE "round_13" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: Who was the opponent when Richmond played as the home team?
SQL: SELECT "away_team" FROM "round_13" WHERE "home_team"='richmond';

Question: What was the attendance at the Kardinia Park game?
SQL: SELECT "crowd" FROM "round_13" WHERE "venue"='kardinia park';