user: Question: What competition has a result of W on June 30, 1966?
Columns: ['Date', 'Result', 'Score', 'Brazil scorers', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['April 17, 1966', 'W', '1-0', 'João Carlos Severiano', "Bernardo O'Higgins Cup"]
SQL:

assistant: SELECT "Competition" FROM "Table" WHERE "Result" = 'W' AND "Date" = 'June 30, 1966';