CREATE TABLE table_name_68 (diff INTEGER, drawn VARCHAR, played VARCHAR)
SELECT MAX(diff) FROM table_name_68 WHERE drawn = 6 AND played > 18
อะไรคือความแตกต่างสูงสุดเมื่อเสมอ 6 และเล่นมากกว่า 18?
What is the highest diff with drawn of 6 and play larger than 18?