Do you agree that over time a number will come up at least 1 in 37 spins? 20 spins are gone and at least 4 numbers have not hit. A number can be asleep for hundreds of spins, but what are the chances that 4 numbers are asleep that long and that you picked those numbers? And in the unlikely event that you did, there is a stop loss in place. I'm working on the tool, just to see what happens. No systems win all the time, but maybe I don't need it to win all the time, or even recover losses on a win. The flat bet might do the trick.

No there's no guarantee a number will come up once in 37 spins.

Take a long period of time say one million spins, but you can make it larger if you wish.

The mean number of appearances of one number is 1,000,000/37 =27,027

The standard deviation is SQRT (npq) =(1/37 x 36/37 x 1,000,000) = 162

https://en.m.wikipedia.org/wiki/Standard_deviationAccording to the normal distribution curve (see above link) there is a 15.8% chance that the given number will be at least 162 (or many more) occurences short of the 1/37 mean of 27,027. The divergence from the mean in absolute terms will be even larger as the trials get larger.

The gambler thinking his number *must* catch up will be disappointed. It may never do. Statistics dictate this. Even if it does catch up to 20,027 he will still lose due to unequal payout. Due to the payout his number needs to significantly ahead to show a profit