user: Question: Who was Richmond's home team opponent?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Melbourne', '18.9 (117)', 'Richmond', '30.16 (196)', 'Punt Road Oval', 20000.0, '16 May 1942']
SQL:

assistant: SELECT "Home team" FROM "Table" WHERE "Away team" = 'Richmond';