user: Question: Which countries won by 9 strokes?
Columns: ['Year', 'Dates', 'Venue', 'Champion', 'Country', 'Score', 'To par', 'Margin of victory', 'Runner(s)-up', 'Purse ( $ )', 'Winners share ($)']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'text', 'text', 'text', 'real', 'real']
Sample row: [2013.0, 'Aug 1–4', 'Old Course at St Andrews', 'Stacy Lewis', 'United States', 280.0, '–8', '2 strokes', 'Na Yeon Choi Hee Young Park', 2750000.0, 402583.0]
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Margin of victory" = '9 strokes';