CREATE TABLE table_41951 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "To par" TEXT, "Margin of victory" TEXT)

What is the Tournament with a Margin of victory that was 4 strokes?
SELECT "Tournament" FROM table_41951 WHERE "Margin of victory" = '4 strokes'
SELECT "Tournament" FROM "table_41951" WHERE "Margin of victory" = '4 strokes'