We excerpt from the Malaysia Chronicle :
Singapore practises a unique kind of electoral system where 75 of the seats are gathered into groups of 4, 5 or 6 and called GRC's. Ostensibly, it is to ensure minority participation but in actuality it stacks the deck against the opposition. In past elections, it was difficult for them to gather the numbers to contest GRCs. It also increased the cost barrier for them, and as a result, the PAP would win the GRCs mostly uncontested. Not this time, though."
Full article in the Malaysia Chronicle at http://www.malaysia-chronicle.com/ titled "Singapore Tsunami - Much Closer Than You Think!"