Lucky 15

4 selections, 15 bets — 4 singles + 6 doubles + 4 trebles + 1 four-fold. A Yankee with singles added. Most UK bookmakers offer Lucky 15 bonuses: double odds on a single winner and 10-25% boost if all four win. At £1 a unit it costs £15. The bonus structure makes Lucky 15s mathematically attractive vs straight Yankees in many cases.