CREATE TABLE table_7218 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

Which tournament had a margin of victory of 6 strokes?
SELECT "Tournament" FROM table_7218 WHERE "Margin of victory" = '6 strokes'
SELECT "Tournament" FROM "table_7218" WHERE "Margin of victory" = '6 strokes'