Yolanda's Pride (2), the 3-5 favorite, rallied down the stretch and beat Maries Melody (5) by a length in Friday's fourth race at Gulfstream Park.
It was the opening leg of the Rainbow 6, with a coming-in carryover of $314,426 on the 20 cents per combination-only bet.
Bettors added $145,457 to the pool--in a prelude for Saturday when Gulfstream will have a mandatory payout of the Rainbow 6 jackpot, regardless of the number of tickets with all six winners.
Gulfstream has guaranteed that the pool for Friday will be at least $500,000 if there is just one ticket with all six winners.
The combination adds up to about $460.000. Thus Gulfstream would need to put in about $40,000 if there is a single winning ticket.
If there are multiple tickets with six winners, Gulfstream will add about $34,000 (24 percent of the day's bet) to the carryover.
That would leave a carryover of about $350,000 for Saturday. Gulfstream history indicates that would lead to $3 million or more in bets on the Rainbow 6.
Friday's Rainbow 6 opener was a $40,000 claiming race at one mile on turf for fillies and mares 3-YO and up.
Yolanda's Pride won in 1:34.79 on the course listed as Firm, with Edgard Zayas riding for trainer Steve Klesaris.