No betselection remains stable, all the time. In one stretch, a win may stretch upto 10x to 15x of the mathematical expectancy. For example, an EC bet should hit once in two attempts(forget house edge here), it may stretch upto 30 spins, any moment. Similarly, we can have only 2-3 hits of an EC in say 50 spins, in extreme moments. These phenomena makes it impossible to form any MM that can beat random small sessions like 200 spins,with any progression. We need to accept that 200 spins are too small sample to understand the wild probabilities of this game.