user: Question: What was the winning score when the margin of victory was a Playoff for the Tournament of Safeco Classic?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Jun 6, 1976', 'Girl Talk Classic', '+1 (72-73-72=217)', 'Playoff', 'Bonnie Lauer , Sandra Post , Judy Rankin']
SQL:

assistant: SELECT "Winning score" FROM "Table" WHERE "Margin of victory" = 'Playoff' AND "Tournament" = 'Safeco Classic';