Belgian ace Christophe Soumillon can open a rare fresh chapter in what is already a distinguished and decorated career at Sha Tin when he rides Luminous for leading trainer John Size in the final event. Size has been the champion trainer for four of the six seasons, and remains in front as he hunts down title number five. Soumillon, whose full-time job is first jockey to the Aga Khan in France, is here on his annual working holiday which is rarely anything but lucrative. Strangely, Size has never called on the champion young jockey before. The records show Soumillon has having had one ride for him, in December 2003, but Size had little to do with that, with the racing having been a leg of the International Jockeys' Championship and the riders are effectively allocated by computer. Luminous indicated at his last outing that a breakthrough beckons. He was caught wide all the way from barrier 12 and boxed on very well for fourth to upset winner Prime Delight, beaten only ? of a length in a compact finish. Luminous is a big, strong gelding who weighed in at 1,251 pounds on Thursday afternoon, and has taken three runs to bring him to his top. The Sha Tin 1,400m circuit is his specialty and he is favourably drawn this afternoon in barrier one, which should give Soumillon the opportunity to follow probable leaders All Time High and Savute all the way. On last night's 7pm tote call, Luminous was a $61 chance, with the Tony Cruz-trained All Time High dominating the market at $35. The swashbuckling Soumillon should make his presence seriously felt at this meeting, where he has eight rides prior to Luminous. On the evidence of the early tote call, the best of them may be the Caspar Fownes-trained Rich Dragon ($49 favourite) in the second event, where the former Australian racer drops to Class Four for the first time.