THE biggest betting fallacy going is 'it's only a Class Six race, how can you have a bet in that grade?' Time and time again these races cut up into only a handful of main chances compared to the other Classes where sometimes as many as eight or nine of the 14 runners have to be conceded a very realistic hope. Last night's Ivan Allan's Rainbow Star was backed down to 2.4-1 favouritism for the third event for which he had improved markedly in the mornings. Drawn out in barrier 12 of the 12 runners, he was always off the track and hung out a little turning into the final bend. In the circumstances he did well to power home for second to Lockhart's Lot, producing a strong burst once they straightened for home and looking as if a move up to 1,800 metres will see him prevail. Earlier, the David Hayes-trained Noble Knight was always travelling like a winner in the opening Class Five 1,000-metre dash.