Here is a free daily playbook – something hardcore horseplayers and casual observers can reference to get informed of each day’s action. DRF handicappers share their plays for the day, including best bets, for racing at Santa Anita, Gulfstream, Belmont at the Big A, Oaklawn, and Churchill Downs. Post Time: 1:52 ET Track: Gulfstream (3rd Race) Horse: SWEN (#2, 5-1) SWEN exits a key race where 2 of 6 returned to win with figs of 96 and 78. The winner returned to take a 20K claimer going seven panels at Tampa. Who doesn't get a good trip in this six horse field? Versatile style helps this 5YO and we think he is better now than when last seen here. -Scott Ehlers Post Time: 2:06 ET Track: Belmont at the Big A (3rd Race)             Horse: AMY'S LIGHT (#3, 9-2) AMY'S LIGHT's last win came when turned back to sprint, and she has been kept in with some tougher company since; turns back again, while also getting some needed class relief.…