user: Question: What was the highest lap for Luigi Piotti with more than 13 grid and a time/retired Engine?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Stirling Moss', 'Vanwall', 87.0, '2:35:03.9', 2.0]
SQL:

assistant: SELECT MAX("Laps") FROM "Table" WHERE "Grid" > 13.0 AND "Time/Retired" = 'Engine' AND "Driver" = 'Luigi Piotti';