PARIS: Epsom Derby winner Workforce upset race favorite Behkabad to win the Prix de l'Arc de Triomphe, Europe's richest horse race. The three-year-old colt, ridden by Ryan Moore, held off a strong challenge from Nakayama Festa on the home stretch to succeed last year's winner Sea the Stars. “He was back to his best today and we got a nice run through,” Moore said. “There was half a gap there and he was very brave and really quickened into it well.” Workforce gave trainer Sir Michael Stoute his first win at the Prix de l'Arc. It was also Moore's fist triumph in the prestigious race held at the Hippodrome de Longchamp in Paris' Bois de Boulogne. Sarafina finished third ahead of Behkabad, the pre-race favorite. Workforce was only given the go-ahead to race after a final training run Thursday following a disappointing showing at the King George VI and Queen Elizabeth Stakes in his previous outing.