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: What is the smallest crowd of the away team that scored 12.9 (81)?
SQL: SELECT MIN("crowd") FROM "round_13" WHERE "away_team_score"='12.9 (81)';

Question: What away team played in Lake Oval?
SQL: SELECT "away_team" FROM "round_13" WHERE "venue"='lake oval';