Monday is closing day of the Pimlico meeting, which means a mandatory payout of the Rainbow 6 wager. This is a 20-cent jackpot bet that normally pays the main pool only if there is a single ticket. That’s a lot like playing the lottery, but must-pay days with a carryover are a great time to jump in. Going into Saturday’s races, the carryover pool stood at $235,492 and if there’s no single-ticket winner over the weekend things will be very interesting Monday. The sequence spans races 4 through 9. Let’s take a look at them. Race 4 Just six horses, so a nice, clean start to the Rainbow 6, right? Not at all. This is a dense thicket of a $16,000 “beaten” claiming dirt route, and it’s really not waffling to say some sort of case can be made for all the entrants. Hot Sriracha and Can He Shine are the pace players and should one of them shake loose from the other, watch out. Maynooth is doubled in price after a claim but can’t be easily dismissed, while Kierland is light on recent form but has older races that might suffice. Maynooth and Kierland would be “C” types for me, while I’d use the two speed horses as “Bs” and focus my play on the top two picks, Kingston Pike and Grand Oasis. Race 5 :: MEMORIAL DAY SALE: Save 50% on Formulator PPs, DRF Plus access, and handicapping reports Queen of Schmooze was switched to turf for her most recent start and might have found a home on it. She got in a pace war last out but has a favorable outside draw this time while taking a step down in class that might not register in her price. Giving her an edge over two more horses who’ve done nearly all their work on dirt, Bustin Hearts and Over Exposed. Those with deeper pockets will cast a much wider net here. Race 6 This first-level turf allowance is difficult to fathom since so few entrants have experience over (or even close to) the extended 1 1/2-mile trip. Jeddo has next to zero chance and Posterity is a very unlikely winner, but the other six all are usable. There are too many spread races in this sequence and my play will focus on my top selection, Tap the Moment, who has the most upside making just his seventh career start and already showed in a last-out comeback run she can stay 12 furlongs. Race 7 The guess here is that lightweight (115 pounds) America’s Prince can get loose on the lead and take this short field all the way. Would I stake everything on that? Not hardly. If you also used Curlin’s Knight, Dedicated, and, to a lesser extent, Pleasant Lee, you’d have this one locked up. Race 8 Egregious stands a decent chance, based on pedigree, of moving way up with the switch to turf. Rate him about equal to first-time starter Bold Trek, though both are entered under this race’s $40,000 claiming option in a maiden sprint. Railmaster is approaching professional maiden status after 12 losses, but they say there’s a race for every horse, and this one might be soft enough for him. Race 9 For me, there are two “As” at most in this $16,000 conditioned-claiming turf route that closes the sequence: Special Intention, whom I’d consider singling, and Electro. For back-ups, consider Ride to the Sunset, Mokheef, and Alkasser.