Smart hurdler Rebel Fitz could only finish second on his novice chasing debut at Killarney.
A winner of the Galway Hurdle as well as two other good prizes last summer, Michael Winters' stable star was pitched into the Irish Stallion Farms European Breeders Fund Beginners Chase after he was well beaten by Hurricane Fly at Punchestown.
Sent off the 4-7 favourite under Barry Geraghty, Rebel Fitz did not do much wrong around the tight County Kerry circuit but could never get on terms with Arnaud (8-1), who made all the running and won by five and a half lengths.
Arnaud had finished third on his chasing bow at Cork last month and trainer Charles Byrnes was pleased to get off the mark.
"I fancied him at Cork, but the ground was worse than it was here. His jumping is brilliant," he said.
"I thought he would have achieved a lot more than he has. He was a second season hurdler and impossible to place. He ended up being badly handicapped.
"We'll stay chasing and keep him going over the summer as he goes on fast ground."
Geraghty went one better when Pur Style (2-1 joint-favourite) put her best foot forward in the Killarney Outlook Publications Handicap Chase.
Edward O'Grady's French import had shown little sparkle on Irish soil but stepping into handicap company for the first time, she showed a good attitude to collar Claragh Native after the last, before running out a two-and-three-quarter-length winner.
Mad Brian (5-1) got off the mark over the bigger obstacles at the first time of asking in the O'Keeffe, O'Shea, O'Connor Solicitors Novice Chase.
With market leader Turban making a mistake with a circuit to travel before struggling to go the pace from the turn, Toner D'Oudairies appeared the most likely winner when striking the front two out, but Keith Donoghue conjured another effort out of Mad Brian and he stuck his neck out to score by a length.
Secret Recipe (5-2) had to work hard to return with a victory in the Irish Stallion Farms EBF Median Auction Race.
Pat Smullen was driving Dermot Weld's gelding along from a fair way out but he eventually hit top gear and once he took the lead off Levanto at the furlong marker, he stretched away to pass the post three and three-quarter lengths clear of Hold The Line.
Kiss Goodnight (4-1) grabbed Lake Louise in the closing stages of the Follow Killarney Races On Facebook Handicap, while last week's Cork scorer College Boy defied a penalty in the Killarney Vintners Handicap.