Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Opponent has a Type of tko, and a Round of 2 (6) on 2006-09-20?

### Inputs:
table_name: table, columns: ['Result', 'Opponent', 'Type', 'Round', 'Date']

### Response:
SELECT Opponent FROM table WHERE Type = tko AND Round = 2 (6) AND Date = 2006-09-20