IT doesn't take a university degree to work out that Irish import Muster Mark has the form on the board required to win the feature race at Happy Valley's special pre-Christmas meeting tonight. The Hong Kong University Alumni Association Challenge Cup is the silverware on offer for what could turn into an entertaining contest for Class Three horses over 1,800 metres. Tonight's meeting was slotted into the calendar to replace the one lost to Typhoon Dot earlier in the season. Muster Mark could give Australian trainer Bruce Hutchison a Christmas present in the shape of his fourth winner of the campaign as he seems to be developing into a useful stayer in this type of company. Muster Mark, when ridden by Jeff Lloyd, looked to have a very similar race shot to bits two starts back but was touched off right at the line by outsider Grey Linnet. The Peter Ng Bik-kuen galloper went on to frank that form when again winning at Happy Valley over 2,400 metres, absolutely hacking up on that occasion. Muster Mark has had one run since then and was crowded for room in the race won by Planet in late November with Gay Pegasus II finishing second. Again that form has held up. Hutchison has engaged Irish champion Mick Kinane for the ride and the Melbourne Cup-winning rider should certainly know Muster Mark well enough as he rode him several times in Ireland. Hutchison said: ''I think he's a good little horse and we are certainly hoping for the best with him here. He has continued to do pretty well since his last run at Sha Tin and he has shown before that he does like the Valley. ''I was pleased to get Mick for the horse as he was due to actually ride him at the Valley previously but had a commitment with David Oughton. I asked him about the horse before we bought him and he told me Muster Mark was a very genuine individual. ''He took a little time to become acclimatised and he has still to win but with a bit of luck it might be tonight. But I don't think he is past the post as there are another couple in this who are quite smart.'' One immediate danger is bottomweight Sweet Win who will be ridden by Basil Marcus and it's ironic that the combination struck at exactly the same time last season. Racing resumed on December 23 last year after the virus-enforced break and Sweet Win handily won over 1,650 metres, giving the impression that he wanted further. Since then he has won again - at the Valley and over 1,650 metres. He does seem to have a preference for the city track and off his light weight poses a big threat here. Hill, who left on Sunday night for America and a Christmas break, said: ''I am pretty happy with Sweet Win. It took us a while to get him worked out after that win at Happy Valley last year. ''But he has been going well and I do not think the trip is any problem now. He is in good form and Basil rides him well. I would be hopeful he would run on well.'' However, the race that holds the key to tonight's feature could well be the Class Three, 1,800-metre event which Planet won on November 28. Miss Piggy finished third, just inches in front of Muster Mark while Long March turned in a promising run just behind, finishing in front of Kowloon Might, a winner since. Miss Piggy is a pound worse off against Muster Mark and the Hutchison-trained stayer, who has certainly held his form if not improved, should reverse placings here. Long March should also have come on but remains something of an unknown quantity. He will be ridden by John Marshall and trainer Peter Tse Yan-sid, successful recently with Most Delighted, has put plenty of work and attention into this fellow. He is an improver and should be included in tierce bets. New Airport has the services of Tony Cruz and is not the roughest as this trip looks just right for him but a more interesting challenger might be veteran Star Mark, to be ridden here by Walter Swinburn. Star Mark has run a couple of times at the Valley and was unlucky on one occasion last season. In an attempt to just shake up the old timer, trainer Brian Kan Ping-chee has gone for Swinburn as a change from stable jockey Felix Coetzee. Patrick Biancone, whose stable is going through a lean period, has Helene Delight involved but there must be doubts about how absolutely genuine this fellow is. He has disappointed on a couple of occasions previously - and at the city track, too. Captain Ron has seen plenty of active service this season and may just be needing a Christmas break - like the rest of us. Despite the presence of top claimer Francis K. S. Lam, he can be opposed. Jogador has proved an overall disappointment with one win on the equitrack surface and New Leaf has not done enough to suggest he is a major threat.