The prospect of a muddling pace is the least of their worries for Glen Boss and Prime Target as the pair head back to Happy Valley tonight to stake their claim for the Hong Kong Club Challenge Cup (1,800m). Boss and the Caspar Fownes-trained Prime Target made merry in just such races earlier in the season, with Prime Target showing the benefit of a summer's growth under daring rides to take his first two starts this term. Each time, Boss took off in a midrace move that left rivals struggling for acceleration and gasping for air over the Valley 1,650m and the 1,800m, and tonight's feature promises to be run in fairly similar fashion. With no recognised frontrunner in the race, it might fall to Solar Power (Manoel Nunes) or Electronics Spur (Marco Chui Kwan-lai) to provide the tour leader, or there may be another mystery pacemaker, given that the lack of tempo is so glaring. But whatever comes, Prime Target has at least shown that he is ready for it with his ability to make a move then sustain it, while some of his main rivals haven't shown the same versatility. After two Valley wins, then a heartbeat second to Perseverance after being held up on the home corner, Prime Target was a failure at his most recent outing at Sha Tin in late November. That may have been the switch in venue or it may have been the rigours of competition catching up with the lightly raced four-year-old. Either way, Fownes has freshened Prime Target up and returns to the gelding's preferred track with a good draw, a light weight and ticks in all the right boxes to win the trophy in an open race. Form horses Mellifluous (Brett Prebble) and Chater Silk (Douglas Whyte) look the major dangers but both concede Prime Target weight. Chater Silk at least will be giving Prime Target a start as well. Chater Silk was impressive beating last week's winner, Fat Dragon, comfortably over 1,650m last time out in fast time and while he has yet to tackle 1,800m, that might be in his favour in this race. Over the mile, both at the Valley and Sha Tin, Chater Silk has always got well back out of his ground and finished on, and perhaps the extra distance and slow tempo will allow Whyte to have him handier from a good gate.