DEL MAR, Calif. - In the middle of Argentina, near a tapering finger of the Sierras de Cordoba, there is a town called Rio Cuarto. Lying on the northern rim of the Pampas, this is gaucho country, steeped in the tradition of the South American cowboy, where a fast horse can become the stuff of legends if he rises above the rest.
The racing world is being asked to believe that such a horse has emerged from Rio Cuarto, that he ran there once, perhaps in June 2002, on a makeshift quarter-mile track laid out on a hard-packed dirt road at the edge of town.