CREATE TABLE table_68005 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What was the margin of victory when the winning score was 9 (72-68-64-67=271)?
SELECT "Margin of victory" FROM table_68005 WHERE "Winning score" = '−9 (72-68-64-67=271)'
SELECT "Margin of victory" FROM "table_68005" WHERE "Winning score" = '−9 (72-68-64-67=271)'