Congratulations!

If the casinos offered a jackpot for every 12 B R B R or any other alternating continuously even chance,then we would have a sure win method,because we could Martingale by betting one time for 1 chance and the next bet on the opposite side and even if would lose our progression by 12th bet,we would won the jackpot which I assume would compensate for the loss of the progression.

It could also happen to win the progression and still win the jackpot too! That would be the best,but I don't know any casino offering such lucrative bonus!