user: ### NOW ANSWER:
Question: Which Goal Difference has 13 Wins, and a Position of 3, and Played smaller than 30?
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, 'Pontevedra CF', 30.0, 45.0, 20.0, 5.0, 5.0, 48.0, 17.0, 31.0]
SQL:

assistant: SELECT AVG("Goal Difference") FROM "Table" WHERE "Wins" = 13.0 AND "Position" = 3.0 AND "Played" < 30.0;