CREATE TABLE table_13421 ("Date" CLOB, "Tournament" CLOB, "Winning Score" CLOB, "Margin of Victory" CLOB, "Runner ( s ) -up" CLOB)

What was the winning score on Aug 21, 1977?
SELECT "Winning Score" FROM table_13421 WHERE "Date" = 'aug 21, 1977'
SELECT "Winning Score" FROM "table_13421" WHERE "Date" = 'aug 21, 1977'