user: Question: What is the Tournament with a Margin of victory that was 4 strokes?
Columns: ['Date', 'Tournament', 'Winning score', 'To par', 'Margin of victory']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Sep 12, 1972', 'Sahara Invitational', '65-69-70-69=273', '–15', '1 stroke']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Margin of victory" = '4 strokes';