Produced with impeccable timing by Ross Geraghty, the eight-year-old foiled a gamble on Michael O'Brien's Swordplay.
The favourite was backed from 5-1 to 3-1 and he landed in front two out. But Geraghty was soon powering through to challenge and Look Between Us quickened clear from the last.
Said Archdeacon: “I can't believe how easily he's won. Everything was in his favour, however, two miles, goodish ground and a light weight.
“Loads of jockeys have told me he needs further, but I think this is his trip. He will definitely go to Galway, as long as there is a little give in the ground.”
Kieren Fallon, still laid low by a bout of flu, missed a winner when David Wachman's newcomer, Play Misty For Me, easily took the Irish Stallion Farms' EBF Fillies Median Auction Maiden.
In-form Wayne Lordan, this was his 10th success of the season, proved more than an able deputy, easing the daughter of Danehill Dancer clear with well over a furlong to run. Lordan soon took his tally to 11 when Tommy Stack's Monsusu made a successful start to the campaign when winning the Tallow Handicap.
The daughter of Montjeu found plenty for pressure to prove too strong for top weight, Dipterous.
Fallon was replaced in this race on heavily-backed favourite, Jaguar On The Run, by inexperienced 10lbs claimer, Sean Leavy. The son of Storm Cat found 9-10, from 6-4, but was trailing the field throughout.
Edward O'Grady's Shannon Arms, touched off late by Vintage Year at Fairyhouse previously, gained compensation in the Coolmore Orpen Maiden.
The four-year-old was given a fine drive by Fran Berry, who continues to very much impress.
He produced his charge with a strong run inside the furlong pole to beat Live In Fear with well-backed favourite, Lightwood Lady, never promising back in third.
John Murphy, fresh from saddling two 20-1 winners at Tipperary, did it again when Pout, a 16-1 shot, took the Ballyclough Handicap.
The three-year-old daughter of Namid was making her seasonal debut, but stripped in fine shape, sweeping ahead in the closing stages for Danny Grant. Murphy missed the contest, however, having a more important engagement at his brother, Hugh's, wedding.
“At long last”, exclaimed trainer, David Kiely, after his Dalian Dawn had taken the Fermoy Beginners Chase in the hands of Derek O'Connor.
Nicely supported in the market, he got the best of a desperate tussle with favourite, Star Horse, over the final two fences.
Donie Fahy (19) from Co Meath rode his second winner abaord the Colm Murphy trained Clew Bay Lodge in the Bumper.
The son of Presenting clearly enjoyed the decent surface, easing to the front two furlongs down and then stretching clear to score by six lengths.