If pedigrees count for anything--and that, after all, is the premise that has kept his father's patrons in business for so long--then Joseph O'Brien was literally born to be a trainer. Not just his record-breaking "sire" Aidan, but also his "dam", Annemarie, back in the days when she held the licence to train jumpers at Piltown, Co Kilkenny, are champions of the profession O'Brien formally embraced only in June. Nonetheless, it is staggering to see such a young man, still only 23, glide so coolly into the crucibles of their...