Roulette strategy - Waiting three system
Game session lasts 37 spins. We do not put, while one of numbers will not repeat twice then we put on this number up to the end of ours 37 spins. By the end of session such numbers can collect some, we put on all of them. The system is based on the law 2/3 on which for 37 spins should drop out only about 24 various numbers, hence, the some people will repeat 3 and more times.