user: Question: When did an away team have a score of 12.9 (81)?
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', '16.13 (109)', 'St Kilda', '11.7 (73)', 'Corio Oval', 15000.0, '5 May 1934']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team score" = '12.9 (81)';