Ruby Walsh announces retirement after win in Punchestown Gold Cup

• Irish jockey retires after win on Kemboy
• Walsh bows out having ridden over 2,500 winnersRuby Walsh, arguably the finest National Hunt jockey that the sport has seen, announced his immediate retirement on Wednesday evening, shortly after riding Kemboy to a two-length victory over Al Boum Photo, the Cheltenham Gold Cup winner, in the Punchestown Gold Cup.Walsh was at his impeccable best for the final ride of his brilliant career. He made the running on Kemboy and then galvanised his