Most racegoers have already conceded this year's Derby to David Hayes' (right) Resfa. And anyone who witnessed the demolition job he did on his rivals in the Classic Trial would be hard pressed to find a reason to oppose him. But racing is a funny game and the work of Derby aspirants Desert Fox and Lord Of Warriors yesterday morning would have brightened their mentors no end. Desert Fox was sent out out in the company of Smart Kid and, with big-race jockey Mick Kinane up, the pair ambled to the home turn before Kinane eased the reins and allowed Desert Fox to dash away from his stablemate. It was good work from the Irish Derby placegetter and trainer David Oughton has plotted his campaign to the minute. There has been gradual improvement in his condition since day one and any rain on raceday will bring him strongly into the reckoning. Tony Cruz has done a great job with the private purchase griffin Lord Of Warriors and he was sent over a solid 1,200 metres with The Establishment. They matched strides throughout but as they picked up the last quarter it was obvious Lord Of Warriors was travelling much the better. He finished fourth in the Classic Trial and, although beaten a long way, it was encouraging the way he got home the last 200 metres. He is another who has had the Classic as his main target since racing started this term and it would be no surprise to see him right amongst it when the whips are cracking. Midweek racing is back at Sha Tin this week with a mixed meeting awaiting punters. The Hayes-trained Songs Of Victory is down for the P&O Challenge Cup and he impressed as he sped home at the end of 800 metres for Basil Marcus. He is a most consistent galloper and should take to the dirt as he is the free-running type that seem to have so much success on the surface. Expedient disappointed last time out when he weakened after leading into the straight at Sha Tin but he ruined his chances that day by pulling early. As such there wasn't a lot left in the locker when Alan Munro asked him for an effort. He went over 800 metres in 50.2 seconds, coming home the last quarter strongly but, more importantly, he appeared to settle well. He hasn't had a lot of racing and should be able to handle Class Three without much trouble. Meanwhile, two trials were held on the dirt with the Wylie Wong-trained Northern Flyer taking the opening heat from stablemate Lucky Fortune. They didn't run any time but Northern Flyer has been improved by one race start and is worth keeping tabs on. Dirt freak Delightful Special took the second from Gold Winner with Just Aqua and Kingston Treasure going nicely in behind. Others to work well were Cool Strike, Energy Power, Merry Star and Ace Academy.