Juddmonte Farms has announced that the stud fee for Chester House, the son of Mr. Prospector who won the Arlington Million Stakes (gr. IT), will be $25,000 when he enters stud at the farm's North American division near Lexington in 2001.Chester House's dam, Toussaud (by El Gran Senor), was a grade I winner in Southern California for Juddmonte, and his 4-year-old half-sister, Honest Lady, is a grade I winner. Chester House, who placed in three graded stakes this year, won six of 21 starts and earned $1,944,545. The Khalid Abdullah homebred was retired after it was determined he was diagnosed with a hairline fracture of the scapula.Besides the Arlington Million, Chester House won the 1999 Brigadier Gerard Stakes (Eng-III). In his first North American start, he finished fourth -- beaten by 3 1/4 lengths -- in last year's Breeders' Cup Classic (gr. I).Meanwhile, Richter Scale, who enters stud next year at Nathan Fox's Wafare Farm near Midway, Ky., will stand for $15,000. The 6-year-old son of Habitony -- Devine Pet, by Bel Bolide, who retires with 12 wins in 25 starts and earnings of $1,139,958. Richter Scale apparently hurt himself in the Forego Handicap (gr. II) on Aug. 30.Fox and his wife, Shelley, purchased a 25% interest in Richter Scale before the 1998 Breeders' Cup at Churchill Downs. His original owners, Richard and Nancy Kaster, kept 75% ownership. First trained by Pat Byrne, then Bill Mott, Richter Scale's most recent trainer was Mary Jo Lohmeier, for whom he won the De Francis Dash (gr. I) on July 15.