An estimated jackpot of $10 million is for up for grabs at this Thursday's (Aug 28) Toto jackpot draw after the past three draws saw no winners.Thursday's draw is the ninth time this year that a cascade draw is taking place.The last time the prize money snowballed to a cascade draw was on July 31 when $12.8 million was won with a single $1 ticket bought online. A cascade draw is triggered when there are no Group 1 winners for three consecutive draws. Under Singapore Pools' lottery rules, the jackpot can only snowball up to the fourth draw.If there is no Group 1 winner at the end of four consecutive draws, the final jackpot amount will be paid to the next prize group with winner(s) and shared equally.That happened on July 17 when 12 Group 2 prize winners shared the jackpot for that cascade draw. Read more