TRAINER David Hill sends only one horse to Happy Valley tonight but Purple Gold could make the long wait to the final event worthwhile. Purple Gold is a noted equitrack runner and Hill has put up stable apprentice Raymond S.M. Tam who gets on particularly well with the horse. With a number in this field striking the surface for the first time, it could pay to side with a horse who does appreciate the ground. Purple Gold is also a noted front-runner and is certainly going to give a major sight. Topweight Silver Arrow is one of those untried on the surface but he ran a fair race over 1,650 metres here a couple of starts back and jockey Greg Childs is hopeful. ''Derek (Cruz) has the horse in good shape and I suppose it will come down to whether he appreciates equitrack. I am fairly used to riding on the surface as I did some riding at Hollywood Park in America. ''I hope he runs a good race as I would like to get another couple of winners on the board,'' said Childs. Meanwhile, Declan Murphy is reunited with smart sprinter Diamond Treasure in the second event and it should result in a second success for the David Oughton-trained youngster. Diamond Treasure looked the part as a griffin and Murphy was aboard at his two juvenile runs, the four-year-old having been introduced to racing following the departure of Oughton's then stable jockey Philip Robinson to England. At huge odds he ran a grand race down the straight 1,000 metres - the only track he's so far been on - to finish third to King Prawn and Champman River at his debut and followed up with a second placing to Gints To Win. That is substantial form and he translated it into a first-up win this season when Mick Kinane scored narrowly from Smile For Me. That has led to his promotion to Class Three but this smart youngster looks fully capable of holding his own in this grade. He is fancied tonight despite the fact that he has not raced on equitrack before or gone round corners in a race. But what he does have is plenty of pace and no lack of determination. When touching off Smile For Me, the now four-year-old looked in need of the run and, in fact, had looked far from a picture in the paddock. But his innate ability got him there and it is reasonable to assume that he has derived considerable benefit from that outing. Diamond Treasure is drawn in barrier four and has Gints To Win on his inside. Although beaten over four lengths last season by Gints To Win, Diamond Treasure now meets that horse on 11lb better terms so has plenty of scope to reverse the form. On top of that, Gints To Win has been off the boil a little recently and has had a number of good chances this season. The Derek Cruz-trained Longain looks a tierce possibility along with bottomweight Super Win Boo. Longain ran third in a similar event earlier this season for Alan Munro so has the requisite equitrack form while Super Win Boo looks at a dangerous mark on his best form. But improving Diamond Treasure should have their measure.