user: Question: Which Opponent has a Round of 4, and a Rules of Thai Boxing?
Columns: ['Result', 'Opponent', 'Method', 'Event', 'Date', 'Round', 'Time', 'Location', 'Rules']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Loss', 'Cyrille Diabate', 'TKO (Doctor Stoppage)', 'Shoot Boxing: S Volume 1', '1 February 2002', '4', '02:18', 'Tokyo, Japan', 'Shootboxing']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Round" = '4' AND "Rules" = 'Thai Boxing';