CREATE TABLE table_9804 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What was the winning score on Aug 28, 1983?
SELECT "Winning score" FROM table_9804 WHERE "Date" = 'aug 28, 1983'
SELECT "Winning score" FROM "table_9804" WHERE "Date" = 'aug 28, 1983'