user: Question: When was the winning score −6 (69-69-73-71=282)?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Jun 23, 1968', 'LPGA Championship', '+2 (72-75-74-73=294)', 'Playoff', 'Kathy Whitworth']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Winning score" = '−6 (69-69-73-71=282)';