Simon Yim Hin-keung's Hong Kong Derby dream was shattered yesterday when stewards slapped him with a five-day ban which will cost him the ride on leading fancy Precision. Yim was distraught after leaving the stewards' room following an inquiry into severe buffeting caused to other runners by New Planet down the straight during the Association Of Hong Kong Racing Journalists Challenge Cup. It was Yim's ninth ban for careless riding in the past year - he had returned only last Wednesday from a nine-meeting suspension. Precision, owned by Yim's uncle, is one of the strongly-fancied runners in Sunday's Derby and Yim's suspension could mean some shifting in the saddles. Trainer David Oughton was not available for comment last night but there was some speculation that Douglas Whyte, who has also won on Precision, may switch mounts. Whyte was down to ride Oughton's other less-favoured runner, Cape Of Good Hope, in the Derby. Apprentice Henry Tsang also copped a three-day ban for careless riding aboard Star Warrior in the third. The Jockey Club's riding ranks were under pressure yesterday, as Eric Legrix was tossed from his griffin mount Winning Laurels in the parade yard and aggravated a left knee injury he had suffered early this year. The Frenchman stood down from the remainder of the day's action, but expects to ride on Wednesday. Eddie Lai was also a scratching after being thrown under the front of the stalls by his griffin mount Villager. Meanwhile, British bookmaker William Hill has opened betting on the Hong Kong Derby, with Ivan Allan's Olympic Express 2-1 favourite ahead of stablemate Aucash at 5-1. How they bet: 2 Olympic Express, 5 Aucash, 11-2 Danamite, 7 Goggles, Super Molly, 8 Jeune King Prawn, 10 Precision, 14 Magical Warrior, 20 Cape Of Good Hope, Dashing Winner, 50 Diamond Moon, 66 bar. Trainer John Moore yesterday declared his youngsters 'the best ever' after Anabatik gave Michael Cahill his second Hong Kong victory. Cahill's other win was a griffin race aboard Moore's Able Choice and the trainer has dominated the youngsters this season with three individual winners. 'They are the nicest team of young horses I have had since I started training in 1985,' Moore said. 'And it's nice to have these horses coming through because quite a lot of my team is made up of much older horses which have done their job. I would say that I'll probably turn over more than 50 per cent of the stable in the next 12 months or so. Hopefully, we can find even more of these naturally talented youngsters to fill their places.' Moore said he had run Anabatik again fairly quickly, just 13 days after his last start narrow defeat, but had his reasons. 'Normally, I would have spaced Anabatik's runs more than that, but I wanted to get another win out of him before April 1,' Moore explained. All the griffin winners are reclassified to race against the older horses from that date and Moore said he was keen to win with Anabatik while he still had the luxury of set weights racing against horses of his own generation. 'Of course, having two wins will mean Anabatik is probably reclassified at the top of Class Three now but at least he has two on the board already,' Moore said. Moore is aiming the son of Anabaa at the Group Three Juvenile Sprint Trophy and, with Ever More and Able Choice to join him, he hopes to have three starters in the May 11 feature race in which Moore was runner-up with Winning Counter last year. Cahill said he had been slightly concerned about the odds-on favourite prior to the start when Villager played up in the stalls. 'With the delay at the start when that horse was scratched, I was a bit concerned about how he would get away, but he jumped brilliantly,' Cahill said. Cahill also teamed with his Derby ride yesterday, Luckswell, as the Alex Wong Siu-tan-trained stayer galloped solo before the first race. 'He seems a real grinder,' Cahill said. 'There is no doubt at all he'll run the 2,000 metres strongly and he feels like a tough sort of horse. I don't know whether he could win, but I'm happy to have a ride at all after only being here a week.' Olivier Doleuze and Derek Cruz partnered up for their usual win yesterday with a 'fresh' Faithful Assurance in the fifth event. Cruz said: 'That's three for the season and he has come really strong this year as I told his owners he would. We just give a rest between runs, he comes back fresh and he's just racing really well.' Doleuze was also on his Derby mount yesterday, Aucash, as the Ivan Allan-trained horse worked with Derby favourite and stablemate Olympic Express and a work mate, Expression. Olympic Express won the gallop, but Doleuze was impressed: 'I felt he worked as well as Olympic Express today. He gave me a good feeling when I asked him for something. It was just a gallop so I didn't pressure him, but I thought maybe we could have beaten the other one.'