user: Question: What was the highest number of extra points scored by albert herrnstein, when he scored more than 15 points total?
Columns: ['Player', 'Touchdowns', 'Extra points', 'Field goals', 'Points']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Albert Herrnstein', 3.0, 0.0, 0.0, 15.0]
SQL:

assistant: SELECT MAX("Extra points") FROM "Table" WHERE "Player" = 'albert herrnstein' AND "Points" > 15.0;