The October yearling sale conducted in Newmarket, England by Tattersalls began on a strong note Tuesday, with the company reporting 25% gain in average.The session's top price of 125,000 guineas was paid by agent John Warren for a Selkirk colt produced from the Silver Hawk mare Pearl Kite. Warren outbid Anthony Stroud for the session topper. Second-highest price Tuesday of 72,000 guineas was also paid by Warren, this time for a Zilzal--Thea colt.Tattersalls reported 189 yearlings sold for 3,603,000 guineas, up 21% over the 2,972,200 guineas gross for 195 horses during the same session one year ago. The average price of 19,063 guineas was up 25% over the session average of 15,242 guineas in 1999. The sale continues through Sunday.