Cheltenham winner War of Attrition completed a notable double when leading from start to finish to land the Guinness Gold Cup at Punchestown.
War of Attrition, who had not run since the festival success in March, always seemed to have plenty in reserve.
Michael Hourigan's two runners, Beef or Salmon and Hi Cloy, ran well to finish second and third.
"He would not have enjoyed going out in front but he was absolutely super," said jockey Conor O'Dwyer.
War Of Attrition set a moderate early pace before beginning to wind up the tempo approaching the 11th fence.
Forget The Past soon felt the change in pace as he clattered the 12th fence and Barry Geraghty was lucky to stay aboard.
However, War Of Attrition made no such mistake and O'Dwyer had time to look over his shoulder coming to the second-last and the seven-year-old only had to be kept up to his work thereafter.
Runner-up Beef Or Salmon turned in a much-improved performance after disappointing at Aintree and Cheltenham to finish a length and a half in front of his stablemate.