One of the great charms of Thoroughbred racing is that it has always been possible for a good horse to emerge from almost anywhere. The diminishing gap between the best and rest, however, will probably make this an increasingly likely occurence. One example is Rolling Sea, who won the Chilukki Stakes (gr. II) at Churchill Downs on Nov. 3. She is by a sire who stands for $2,500 and is out of mare who finished fourth in a $6,500 claimer in her final race.