user: Question: What event was the opponent Karl Knothe and had a Submission (rear naked choke)?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Loss', '8-2', 'David Heath', 'Submission (rear naked choke)', 'UFC 62', '1']
SQL:

assistant: SELECT "Event" FROM "Table" WHERE "Method" = 'Submission (rear naked choke)' AND "Opponent" = 'Karl Knothe';