user: Question: Which Opponent has a Type of TKO, and a Round of 2 (6) on 2006-09-20?
Columns: ['Result', 'Opponent', 'Type', 'Round', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Win', 'Gabriel Rosado', 'TKO', '10 (12)', '2013-10-26']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Type" = 'TKO' AND "Round" = '2 (6)' AND "Date" = '2006-09-20';