A mandatory payout of the 20-cent Rainbow 6 pool yielded multiple $4,240.26 payoffs Sunday at Gulfstream Park in Hallandale Beach, Fla. The popular multi-race wager had gone unsolved for five racing days following Feb. 26 mandatory payout, creating a carryover pool of $274,672.44 going into Sunday’s mandatory payout, which generated an additional $3,501,179 in wagering.