user: Question: When did the match take place that had a home team score of 7.9 (51)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Collingwood', '15.19 (109)', 'Essendon', '4.5 (29)', 'Victoria Park', 25000.0, '1 August 1925']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Home team score" = '7.9 (51)';