This system called the John Wayne system is relatively simple. It works by putting just 10 units on the table to cover 18 numbers in the following way: you choose any two numbers (there should be a small distance between them) in the middle column (for example 11 and 26) and you bet one unit on these two numbers. Then each of the corners which are adjacent to the selected numbers must also be bet on one unit.
If you hit one of these corner numbers, you have a loss of one unit, if you hit an adjacent number among corners, then you make a profit of 8 units and in case of hitting one of two selected main numbers, you reach a nice profit of 62 units.
What do the Statistics say?
Having a bet on 18 out of the 37 total numbers, the probability of winning in roulette (or hitting at least one number) on each spin is 48, 65%. The results of all one hundred attempts are as follows: you lose 51, 35 times a loss of 10 units; 21, 62 times a loss of one unit; you win 21, 62 times a profit of 8 units and 5, 4 times a profit of 62 units. The recapitulation of all attempts is that you lose 27, 36 units.
Therefore it should result again in a loss. We have attempted to design a progression: