Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_68 (diff INTEGER, drawn VARCHAR, played VARCHAR)
### Question:
What is the highest diff with drawn of 6 and play larger than 18?
### Answer:
SELECT MAX(diff) FROM table_name_68 WHERE drawn = 6 AND played > 18