user: Question: Difference of - 20, and a Position smaller than 17 is the highest against?
Columns: ['Position', 'Team', 'Points', 'Played', 'Drawn', 'Lost', 'Against', 'Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: [1.0, 'São Paulo', 78.0, 38.0, 12.0, 4.0, 32.0, '34']
SQL:

assistant: SELECT MAX("Against") FROM "Table" WHERE "Difference" = '- 20' AND "Position" < 17.0;