Last week’s Breeders’ Cup World Championships all but closed the book on an unprecedented year in horse racing. A sport anchored in tradition and continuity had its calendar upended in 2020 by the COVID-19 pandemic, resulting in a rescheduled and reshuffled Triple Crown that started with a shortened Belmont Stakes Presented by NYRA Bets in June and ended with the Preakness Stakes on the first weekend in October.