JET SPEED (Nap) looks the day's best bet at Sha Tin this afternoon and you do not have to wait long for him. He is in the first of the eight races and, while it is only a Class Six contest, it still appeals as a very attractive betting medium. So often a lot of nonsense is spoken about Class Six races along the lines of ''how can you have a bet in that race? It's full of such bad horses''. In fact, that is precisely the reason to have a bet. So many of the horses in the race are decidedly moderate and can almost certainly be eliminated from the betting equation. Of course, there will always be one or two cases where a slip-up is made and one seeming no-hoper gets under the guard. But that is a far more common occurrence in the better quality races. Overall, it is these Class Six races, which are the least competitive and can be reduced to just a handful of chances, thus lending themselves to profitable betting. In this afternoon's first race, it is very hard to get away from Jet Speed, who performed consistently well last season and has had the benefit of a run this time round. He was a winner course and distance last season when beating Talisgold by a neck in a Class Five mile handicap with Good Boy, who is one of today's main rivals, three and a quarter lengths back in fourth. On the bare form of that run from just over 12 months ago, Good Boy is entitled to reverse the placings with Jet Speed as he is now fully 19 pounds better off and has also had a run this season. But the problem for potential Good Boy backers is that he is a bad-legged individual and is a very hard horse to train - even for someone as good with this type as Lawrie Fownes. The leg problems have taken their toll on Good Boy and, while he is conceded a very real tierce chance, he is not fancied to beat Jet Speed, even at the revised weights. Jet Speed also progressed to put in a couple of cracking efforts at the back end of the campaign just gone. Probably his best run was when one-and-a-half-length second to Super Power in Class Five, again over today's course and distance of the Sha Tin mile. The form of that race has worked out really well with virtually all the horses finishing behind having progressed to run good placings. These include Saint Dragon Hill (third), Karaoke (fifth), Mr Nice Guy (sixth), See The King (eighth), Radiant Sun (ninth), Einhorn (10th), Gagne Vite (11th) and Malayan Bright (12th). Besides Good Boy, the main danger is likely to come from Gary Ng Ting-keung's Tomodachi, who has the considerable assistance of Tony Cruz in the saddle. Tomodachi shaped last season as if a mile would bring out the best in him and it looked that way when he ran a highly creditable third to Prince Baikal and Super Delight first time out over today's trip. He then was not beaten by much when sixth and far from disgraced behind Gold Capture in a much better race than this over 1,800 metres in Class Five. He looks a real threat and the main quinella chance with Good Boy for the tierce slot. It could pay dividends to stick with Wylie Wong's Fun And Smile in the third event. He was a shock winner first time out over 1,400 metres when ridden by maximum-claiming apprentice K. W. Lee. A combination of the distance and the jockey conspired to make him a 56-1, but he will not be at any fancy odds this afternoon. He has done plenty of work since then and done it well. He shapes as if the move to a mile is just what he wants and will soon be requiring further. He is bred to stay really well. The main danger, apart from the mile possibly being a touch on the short side now that he is up in the weights and no longer running fresh, could come from Bumper Star. He can almost be viewed as a winner without a penalty and must be taken to reverse the form with Blazing Fire, now that Eric Legrix takes over from Raymond Tsui. Winning Wave, another who will benefit from the move to a mile, looks best of the rest.