Each time, if your queue number is "bigger" than the no. of available units or the quota for your ethic grp has reach max liao, you are given additional chances in your next application so on etc.. However, at any one point when your queue number is within the no. of available units or within the ethic grp is still available...and you chose not to choose any unit.. Your additional chances will be reset back to ZERO in the next application....cos you chose to give up when there are available flats for you. The additional chances are really for those who really has no chance of getting any flat at all esp my friend always has "thousand plus" queue number for WIS...really pathetic...