Courtncatcher knuckled down to claim top honours in the Martinstown Opportunity Handicap Chase at Leopardstown.
Patrick Duffy's charge was a 12-1 chance having filled the runner-up spot on his latest appearance at Thurles earlier in the month.
The nine-year-old was one of a number of horses in with a chance rounding the home turn and showed a good attitude after the final fence under Conor Brassil to prevail by two and a half lengths.
Thomond was second ahead of Dallas Cowboy in third.
Gambled-on favourite Katnap was bitterly disappointing.
Duffy said: "He's been running very well but not clicking. He ran well in Cork in the National but maybe didn't get home.
"I've only the one horse so I'm up against it.
"I'm over 80 and I ride him every day. I ride fast work as well. Nobody else rides him but me."