user: Question: What date has a margin of victory of 1 stroke over Greg Kraft?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['22 Apr 1990', 'KMart Greater Greensboro Open', '–6 (74-71-71-66=282)', '2 strokes', 'Mike Reid , Jeff Sluman']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Margin of victory" = '1 stroke' AND "Runner(s)-up" = 'Greg Kraft';