user: Question: What team was the home team when Richmond was the away team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '15.9 (99)', 'Melbourne', '10.15 (75)', 'Corio Oval', 19500.0, '27 June 1925']
SQL:

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