A BLUNDER by race officials robbed top Hong Kong junior triathlete Brian Bozarth of a victory in the Chicago Triathlon. The event, which attracted more than 8,000 competitors, was thrown into chaos at the start when organisers decided to shorten the swim leg from 1,500 metres to 300 m because of choppy seas. Brian did not let the late alteration of the course bother him. He came out of the water in No 1 position in three minutes and 15 seconds. The 19-year-old Asian junior champion built up a commanding 11/2-minute lead in the junior division after the 40-kilometre bike leg and was pulling away on the run when disaster struck. Brian was so far ahead of the field that race marshals had yet to set up their positions at the turn-around point on the 10 km running course. He missed the mark and ran straight on for another four minutes before realising something was wrong and turned back, rejoining the race in ninth position. The athlete gave all he had and moved up to third, but ran out of steam and was outsprinted in the final run-in. He had to settle for fourth place. ''It was really disappointing because I've never felt better starting the run,'' said Brian, who has spent the summer training with top professionals in Boulder, Colorado. ''I should have won it because I was pulling away from the other boys, but missing the turn-around meant I lost almost 10 minutes.'' The high-altitude training in Boulder seems to have worked wonders for Brian; he led all the way in the Pueblo Triathlon three weeks ago, to win his first open title.