Bobs Worth gave Nicky Henderson and Barry Geraghty a quick-fire double in the RSA Chase.
Backing up the earlier victory of Simonsig, the 9/2 shot fought off Irish raider First Lieutenant (9/2) on the run from the last as hot favourite Grands Crus faded into fourth.
Bobs Worth and First Lieutenant were always prominent and vied for the lead at the top of the hill, where the well-backed Grands Crus (6-5f) eased into contention.
The trio were in line jumping three out but it soon became clear that the popular grey was fighting a losing battle as last year's festival winners went on again in the straight.
And it was Geraghty's charge who found the most under pressure from the last, forging two-and-a-half lengths clear with another Irish-trained runner Call The Police (20/1) staying on best for third ahead of the weary favourite.
Geraghty said: "He just keeps winning. He's a simple sort really, he jumps and he tries.
"He won his three hurdles round here and now he's won his chase so he's four from four. He's just so genuine."
Henderson added: "What a tough horse. Barry gave him a wonderful ride but he's got to do that because he sold the thing to me!
"I haven't been happy with him at any stage this season. We fiddled with his wind in January and he was the last horse in the yard to get his coat. His jumping hadn't been great either.
"Barry has had two armchair rides so far this week, but he's had to sing for his supper on that one.
"Everybody has worked incredibly hard and it's been a long battle to get him back.
"I'm amazed we've got him here in that sort of form and because it's been a rush, that will probably be it for the season."
David Pipe could offer no excuse for the eclipse of Grands Crus.
He said: "Scu (Tom Scudamore) said that he just didn't finish his race off. He travelled well and jumped well but just didn't get up the hill. Hopefully there will be other days for him."