user: Question: What was the smallest crowd during a game where the home team scored 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: ['Richmond', '14.10 (94)', 'St Kilda', '11.14 (80)', 'MCG', 44710.0, '7 June 1969']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Home team score" = '12.9 (81)';