The Rainbow 6 jackpot is paid out only when there is a single unique ticket sold with all six winners. On days when there is no unique ticket, 60 percent of that day’s pool goes back to those bettors holding tickets with the most winners while 40 percent is carried over to the jackpot pool.

Friday’s Rainbow 6 spans Races 4-9 and includes a maiden special weight for horses 3, 4 and 5 years old going 1 1/16 miles on the main track. Favored at 7-5 in a field of seven is Three Diamonds Farm’s 3-year-old Uncle Mo gelding Afjan, who will race with blinkers off in his first start for Keri Brion after running previously for trainers Mike Maker and Hall of Famer Todd Pletcher.

The feature comes in Race 8, an open allowance sprinting seven furlongs on the main track for fillies and mares 3 and up. Bob Bone and Ed Brown Jr.’s R B’s Star, a four-time career winner, is the 2-1 program favorite over Brereton C. Jones’ homebred filly Skipper Sue, an 11-length maiden special weight winner over her elders in debut Oct. 14 at Laurel for fall meet leading trainer Brittany Russell.

Herringswell Racing Club’s Flimsy, shortened up and returned to dirt by trainer Graham Motion, exits a fourth in a 1 1/16-mile restricted turf allowance against older horses. Pepe Stables’ Murph, winner of the 2021 Small Wonder at Delaware Park for Russell, races for the first time since being claimed out of a runner-up finish Oct. 27 at Laurel.

The 18-year-old Barbosa has not ridden since being involved in a four-horse spill Nov. 8 at Parx, escaping serious injury. He took last weekend off and is named in eight of nine races Friday and Saturday and seven of nine races Sunday at Laurel, with mounts Friday and Saturday night at Charles Town. He originally had been expected to miss weeks or even months.

Other tracks in the Mid-Atlantic also are offering carryovers as the racing weekend approaches. They include:

• Charles Town, with a carryover of $10,238 in its jackpot pick six wager. Charles Town’s next live racing card is Thursday evening at 7:00 p.m.
• Penn National, with a jackpot super high five carryover of $2,125. Penn National next races Friday evening at 6:00 p.m.
• Parx Racing, which has a $337,266 carryover in its jackpot pick five. Parx’s next live card is Monday, November 21 with a first post of 12:25 p.m.