Here is another example so that it becomes easy to understand.

The circle on the left are the 20 numbers. (up to 13 ).

We start with 12 , then add 3, 1, 23, 31, 24, 29. (numbers that are not the previous 20 number list).

12 and 1 did not appear in the next 37 spins. So we would've lost 37x2=74 chips if we carried it to 37 bets. .

3 won 28 chips

23 won 14

31 won 14

24 won 2.

29 won 36.

Next in line to be played is 6 and 19. if you follow the 6 it too lost 37 chips.

But 19 won 34 chips .

Even thought it seems that there were some losses, here is the amazing thing that can happen:

12 and 1 and 6 would've lost 37 chips each if you followed them betting all the way to 37 spins.

But if you count your chips after 19 won, you are still far ahead with a positive balance

Because at that point 12, 1,and 6 have not been played for 37 spins yet.

So by stopping right there you walk away with a profit.

Actually up to the time 19 won, 12 only lost 21 chips. 1 lost only 15 chips, and 6 only lost 3 chips.

( and not 37 chips each).

The reason I carried those numbers all the way to 37 spins was for comparison purposes (profit vs. loss).

But it was more that made up by the winning numbers, if you stop.

So if you stop after 19, you have a good profit and you don't need to continue with the losing numbers.

The basic idea is that you stop when the winning numbers give you a positive balance, and you don't have to carry the numbers that were destined to lose all the way to 37 spins.