Tidal Bay got up in the final strides to land what looked an unlikely victory in a thrilling renewal of the Lexus Chase at Leopardstown.
Ruby Walsh got an amazing run out of the Paul Nicholls-trained gelding to pass several rivals on the run-in to give owner Graham Wylie a second Grade One on the card after Back In Focus took the Topaz Chase.
In a bunch finish, Tidal Bay (9-2) snatched the spoils from First Lieutenant, with Flemenstar and Sir Des Champs just behind.
The Neil Mulholland-trained Midnight Chase made the running with Hidden Cyclone and Quito De La Roque on his heels and Tidal Bay held up in the rear.
Hidden Cyclone went on during the final circuit while Flemenstar appeared to be going ominously well as Peter Casey's stable star tried to take his winning sequence to eight, on his first try at three miles. China Rock led two out, but Flemenstar was still going best and landed over the last with the race to win. However, his stamina appeared to give out on the soft ground on the run to the line.
Tidal Bay still had a few lengths to make up but he found what was necessary as Walsh produced him between horses, getting up to score by a head from First Lieutenant with Flemenstar third. Sir Des Champs was just behind but his chances of success were not helped by his jumping.
Nicholls said: "The extra two furlongs at Cheltenham will suit him well. He's in the form of his life for an 11-year-old. Roll on Cheltenham."
Wylie said: "This is up there with Inglis Drever. Back In Focus and now Tidal Bay. Both looked like they were beat over the last and both came with a great run in the end and just nicked it. I thought our fella was cooked four out, but then he started to come again. He's just got guts that horse. Paul has done an amazing job with him and Ruby as well. He gave him a great ride because you have to be patient."
Walsh said: "He jumped the second-last well and I got through the gap going to the last. He was really finishing and I thought I had a chance of getting to them. He was a bit flat-footed at the last and he took time to pick up, but when he did he started to fly and I guess 100 yards down I was thinking I was going to get there.
"Everyone was in the same boat. We all knew Flemenstar's stamina had to be tested and Midnight Chase went a good honest gallop and the tempo was upped all the way. It was a real true-run contest. He's a different horse this year. He won at Wetherby, was second in the Hennessy at Newbury and has come and won today. It's brilliant."
30 October 2014Grece excels at Saint-Cloud
Hawk given Greatwood option
Royal summons for Apache
Hannon: Early speed key for Osaila
Bowe takes aim at WKD bullseye
Hootenanny 'smoking' for BC mission
Avenue roads lead to Newmarket
Shu to be kept busy
Scu sweet on Sensation Ascot raid
Murtagh succumbs to Cup charms
Dandino to stay in Australia
Glance denied Mackinnon defence
Bailey ace rules Supreme at Taunton
O'Brien hit by Magician blow
Diablo in big-race picture
Buckley raises Toast to Osborne
Pastille seeking four-timer
Conti all set for Charlie Hall
Barnes out to storm Saint-Cloud
Williams issues Buywise warning
Lynam reveals Slade stalls fears
29 October 2014Lame Magician out of Breeders' Cup
Diablo in big-race picture
Mullins enters strong Hennessy team
Damaged hock behind Estid reverse
Eckhart team rocked by injury blow
Hunt Ball makes Power play
Morgiana a T bone of contention
Kirby ponders Buttons French raid
Glance camp turn to Williams
Wohler trusts 'professional' Moore
Red alert to Cup challenge
Head targets more Mile glory
Mile hope Toronado in 'great form'
Telescope camp banking on Moore
Twiston-Davies link excites Moore
Flying third to Bob on hurdling bow
Harden to test top staying waters
Godolphin take share in Belardo
Mullins has big guns at Down Royal
Annacotty set for Kempton return
Powell and Bradley cleared
28 October 2014Fingal camp on weather watch
More injury woe for Popham
Dickin unveils Thomas gameplan
Power stalls in Flemington spin
Toast drawn nine in BC Classic
My Ambivalent passed fit by vets
Harry out to bring House down
Three and easy for ton-up Hanagan
Wood carves out Galway verdict
More Of That in Wetherby frame
Big guns confirmed for Charlie Hall
Byron pencilled in for Far East
Newbury reverts to original title
Magician to stay in the US
Henderson considers hurdles for Bob
27 October 2014Mountainous back on National trail
Ground to dictate Gold run
Elite aim for Rendezvous
Classic dreams at Leopardstown
Smullen celebrates seventh title
Cheltenham target for Module
Pete shows his Aintree mettle
Royal-Oak double for Boistron
Starchitect in surprise strike
New One given Haydock mission
Balding excited by Park prospects
Sights set high for Crafty