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 was the home team's score when they played at Lake Oval?
SQL: SELECT "home_team_score" FROM "round_13" WHERE "venue"='lake oval';