As I posted in the gambling Philosophy section, this system of mine had performed quite well, and originated with the Monty Hall paradox in mind.

The selection can be made on dozens or columns, or both. I used to play both in the same time using a notepad to keep track of numbers and totals. To simplify I show how to play with dozens, you can mirror it for the columns.

I play the last two dozens that got hit, avoiding the late one. I will use a positive progression, adding one every time I got one hit. I will add one to both dozens.

Example (actual play at b&m casino)

15

19

11 (started play now, betting one chip on 2nd and one chip on 1st dozen), total betting -2

34 betting 2, total -4

19 betting 2, total -6

13 hit, win 3, betting 4, total -7

36 hit, win 6, betting 6, total -7

16 hit, win 9, total +2. Session ended. Start betting 2, total -2

10 betting 2, total -4

3 hit, win 3, betting 4, total -5

29 betting 4, total -9

12 hit, win 6, betting 6, total -9

16 betting 6, total -15

22 hit, win 9, betting 8, total -14

19 hit, win 12, betting 10, total -12

6 hit, win 15, total +3. Session ended. Start betting 2, total betting -2

13 betting 2, total -4

33 betting 2, total -6

27 hit, win 3, betting 4, total -5

16 hit, win 6, total +1. Session ended. Start betting 2, total betting -2

25 hit, win 3, total +1. Session ended.

You got the idea. The goal is to have a series of winnings in a row, relying on the fact that we play 24 numbers out of 37/38.

I added a tweak after few weeks of playing to solve the problem for the sessions with many loss-loss-win-loss-win-loss-win... This situation of alternate winning and loss can be the nail in the coffin of the system, as you can easily imagine.