Since Aidan O'Brien first came to Chester in 2005, the year that the stable opened its account in the Listed Dee S. with Gypsy King (Ire) (Sadler's Wells), the May Festival has acted as a stage set for the yard's dominant actors in the middle-distance category. Thursday's edition of that 10-furlong Derby trial went their way for the 10th time as San Antonio (Ire) (Dubawi {Ire})--Rain Goddess {Ire}, by Galileo {Ire}) manipulated the bends of the Roodee circuit with a professionalism that belied his inexperience. As tactical as it gets...