 She ranks among a tiny handful of mares who have produced multiple Group/Grade 1 winners, with four.Chester House (born in 1995 by Mr. Prospector) was first, winning the Arlington Million (Gr.1) in 2000.Advertised as a "genetic masterpiece", Chester House also showed promise as a stallion before cancer cut his stud career short in 2003, after only three years at stud.