The Douglas Whyte-Cosmo Success combination has been almost unbeatable and Triple Trio players would be well advised to stick with the pairing in tomorrow night's final leg at Happy Valley. There's every reason to play, too, with a $6.5 million jackpot, which should ultimately lead to a pool estimated at $15 million. Over the 1,650-metres circuit at the city course, Whyte has ridden Cosmo Success on five occasions for four wins, with his only failure coming on a rain-affected track, which the Dennis Yip Chor-hong-trained gelding does not handle. Cosmo Success showed he was ready to return to competition when winning a barrier trial over 1,700m at Happy Valley on September 3. With Michael Rodd in the saddle, the five-year-old settled off the speed before coming to the outside in the home straight and finishing off strongly to win by a half-length from Winning Sunshine, who was narrowly beaten when resuming two weeks ago. There appears to be good speed in the race through renowned front-runner Money Strong and Dashing Champion will likely take a forward position from the inside barrier. Money Strong could well prove the horse for Cosmo Success to run down if he arrests the front. The Derek Cruz-trained gelding has proven to be a different horse when finding the lead and scored three brilliant wins around Happy Valley last season. Art Trader goes to Happy Valley for the first time but with a drop to Class Two, the John Moore-trained gelding looks well placed on his best form of last season. Fighting Mascot, from an inside gate, Dashing Champion and Crystal are all nicely placed and worth including for those looking to cast the net wider. In the opening leg, a fitter Liverbird looks placed to advantage and should be ready to improve on his first-up fourth at Sha Tin 17 days ago. Liverbird has only been to the Valley on one occasion but was desperately unlucky in finishing seventh to Easy Game, after being held up for the entire length of the straight. His record should be better than it appears, as he was also out of luck at Sha Tin on May 14 when short of racing room in the early part of the straight before being checked at the 200m mark. Also worth including are Chinook, Sunny Desert, Happy Kid, Aurelian and Happy Crusader. In the middle pin, Daneman Hill, from the prized inside barrier, looks the best banker option. The Ricky Yiu Poon-fie-trained gelding was a well-supported favourite first-up at this track two weeks ago but was attacked in the lead for the entire race and did a commendable job to hold third behind Chosen One. He scored brilliant all-the-way wins at his previous two starts over this course and distance and looks nicely placed in Class Four for a horse in such form. Namjong Hero is a runner of interest and shapes as the main danger to Daneman Hill. The smart performer from Peter Ng Bik-kuen's yard turned in a remarkable display to win on debut back in February but was found to have suffered a bleeding attack following the run. He was tuned up for his return with a soft trial behind Shining Light on September 9 and looks to be coming to hand well. Glory Years, from an inside gate, Super Fighter, Euphoric Kid and Croissant all have claims, while last-start winners Chosen One and Soldier On are going to need luck from their wide gates.