user: Question: What is the sum of the rounds of the match with Brett Chism as the opponent?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '8-3', 'Rodney Wallace', 'Decision (unanimous)', 'Scrap Live 7: Bad Intentions', 3.0, '5:00', 'Winston-Salem, North Carolina , United States']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Opponent" = 'Brett Chism';