Dinoblue led home a one-two-three for trainer Willie Mullins and owner JP McManus in the Paddy's Rewards Club Chase at Leopardstown.
A field of five runners went to post for the Grade One contest, with Henry de Bromhead's 6-4 favourite Captain Guinness the only outlier in an otherwise Closutton dominated line-up.
It was clear from a long way out that it was going to be a clean sweep for the champion trainer, with the market leader never able to get to grips with a strong pace and eventually pulled up by Rachael Blackmore in the back straight.
Gentleman De Mee was deployed in a front-running role, but he was a sitting duck at the top of the home straight, as stablemate Dinoblue moved into his slipstream under a motionless Mark Walsh.
Once given her head, the 9-4 shot soon pulled away and safely negotiated the final fence to score by seven and a half lengths.
Saint Roi was third, with the other Mullins runner Dysart Dynamo falling at the last.
The Grade One Paddy's Rewards Club Chase at Leopardstown goes the way of Dinoblue (9-4) for trainer Willie Mullins and jockey Mark Walsh. pic.twitter.com/pruAvVFhiQ
— RTÉ Sport (@RTEsport) December 27, 2023
"Gentleman De Mee set a great pace in front and jumped fantastic. I wondered at one stage would she [Dinoblue] be able to stay jumping with him but she held her jumping together," said the trainer.
"When he took a blow, she kept galloping and she is improving all the time. I'm very happy with that."
