user: Question: What is the highest amount of goals with more than 51 goals against and less than 30 played?
Columns: ['Position', 'Club', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Elche CF', 30.0, 40.0, 18.0, 4.0, 8.0, 73.0, 38.0, 35.0]
SQL:

assistant: SELECT MAX("Goals for") FROM "Table" WHERE "Goals against" > 51.0 AND "Played" < 30.0;