user: Question: Who was the runner-up when the margin was 1 stroke?
Columns: ['Year', 'Winner', 'Country', 'Score', 'Margin', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2008', 'André Bossert', 'Switzerland', '265 (-15)', 'Playoff (1 hole)', 'Markus Brier']
SQL:

assistant: SELECT "Runner(s)-up" FROM "Table" WHERE "Margin" = '1 stroke';