CREATE TABLE table_35309 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Which Date has a Winning score of 9 (70-64-70=203)?
SELECT "Date" FROM table_35309 WHERE "Winning score" = '−9 (70-64-70=203)'
SELECT "Date" FROM "table_35309" WHERE "Winning score" = '−9 (70-64-70=203)'