In the 1940’s and 1950’s, US Mob-controlled casinos in Cuba did great international business. The craps, blackjack and roulette tables were constantly busy, and the Martingale was a favorite gaming system for players new to the casino scene. Locals favored roulette, and their betting method on the game became known as the Cuban Betting System.
The system itself is similar to Green-Black Attack, where the player covers most of the numbers on the wheel with just a few wagers. And, it is a hybrid system, because it involves an even-money wager (Black) as well as a column wager, which pays 2 to 1 when it wins.
Because a roulette layout has red and black numbers mixed in a haphazard way, the third column includes only 4 black numbers out of 13. By wagering on Black and the third column, a player is able to win with any black number as well as the 8 red numbers (3, 6, 9, 18, 21, 27, 30, and 36). So, if any one of 26 numbers comes up, the player wins. If a red number in the first or second column comes up, the player loses both wagers, as well as the times when green is spun.
When playing on a European roulette table with a single green, the house edge is lowered from 2.7% to just 1.80% because when zero spins, the player will receive half of their Black wager back under the En Prison or La Partage rules.
The Cuban Betting System can be ramped-up by increasing the wager on black and the third column after each win. The wager on the column only has to hit once in three spins to stay close to even, so a small increase (say 20%) after a win can lead to a much larger hit if several consecutive 3rd column numbers are spun. After a miss, reduce both wagers back to base and start again.