CREATE TABLE table_name_19 (date VARCHAR, winning_score VARCHAR)
SELECT date FROM table_name_19 WHERE winning_score = −9(70 - 64 - 70 = 203)
วันใดมีคะแนนชนะที่ −9 (70-64-70=203)
Which Date has a Winning score of −9 (70-64-70=203)?