Daily Empress Indy Silverstone จัดขึ้นในรอบไหน?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Daily Empress Indy Silverstone took place on which round?It is not neccessary to use all the tables.
 table_22673956_1:  (rnd [ INTEGER ] race_name [ VARCHAR) ]
SELECT MAX(rnd) FROM table_22673956_1 WHERE race_name = "Daily Empress Indy Silverstone"