ARCADIA, Calif. - With Cambiocorsa having been retired, the queen of the hill has abdicated her throne. Cambiocorsa was the undisputed queen of Santa Anita's hillside turf course, over which she won several stakes, including last year's Irish O'Brien Stakes. Six older California-bred fillies and mares are signed up for this year's $125,000 Irish O'Brien on Saturday, and though River's Prayer and Gn. Group Meeting are the most accomplished of the group, La Tormenta is an intriguing alternative, most notably because of her aptitude over the tricky 6 1/2-furlong turf course.