Paul O'Sullivan's smart sprinter Good Boy Boy showed he will be ready to rumble when next produced with an eye-catching trial performance at Happy Valley last Saturday. The five-year-old showed blistering gate speed in a 1,000m jump-out, cruising away to a big lead before Derek Leung Ka-chun dropped his hands late and idled to the line. The Andy Leung Ting-wah-trained Smart Choice (Brett Doyle) did well to nab the speedster on the post, stopping the clock at 1.00.36, but the runaway leader had done enough to suggest he will add to his already impressive record of four wins from nine starts this season. Even though Many Gains is now eight, a slick trial on the same day proved he could continue his rich vein of form. Many Gains had a solitary win from 37 starts for Manfred Man Ka-leung, before a transfer to Caspar Fownes' yard saw the gelding victorious in his first three starts. He finished the 2010-11 season having won four of his last six and never missing a place for his new trainer. You would think he would be well-exposed with a rating of 70, but the son of Fusaichi Pegasus may have another Class Three win in him yet if this 1,200m hit-out is any indication. Vincent Ho Chak-yiu was forced to sit wide from barrier eight, and while he had to shake the veteran up a touch in the straight, he overhauled the leaders with a decent turn of foot to score by a half-a-length. Dead-heating for second were two to watch also; Danny Shum Chap-sing's Enhanced and Many Gains' stablemate Vanquish Delight, who flew along the outside running rail after being taken off the track. An earlier 1,200m trial revealed two early-season contenders in Elite Fortune and Group One-placed Brave Kid. The Tony Millard-trained Elite Fortune (Leung) did an ultra-professional job in front, leading all the way under a strong hold to score by 1/2 lengths in a comfortable 1.13.55. Hopefully the John Size-trained Brave Kid's effort in second proves he has shrugged off a disappointing 2010-11 campaign. Brave Kid was unplaced in four tries last season after he had won his first six starts before finishing third in the 2010 Derby. Douglas Whyte didn't ask the six-year-old, sporting blinkers, for much but he chased right to the line and tracked the leader well in the run.