user: Question: What was Olazabal's margin of victory int he Ebel European Masters Swiss Open?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['7 Sep 1986', 'Ebel European Masters Swiss Open', '−26 (64-66-66-66=262)', '3 strokes', 'Anders Forsbrand']
SQL:

assistant: SELECT "Margin of victory" FROM "Table" WHERE "Tournament" = 'Ebel European Masters Swiss Open';