Here it is not really a martingale but rather a method of play based on a number and all its opportunities.
Better than long explanations, here is an example. The number 19 comes out, so we will build the following way:
- 1 unit on entire 19
- 10 units on Red
- 10 units on Odd
- 10 units on Low
- 3 units on 2nd dozen
- 3 units on 1st column
- 2 units on sixain (16-21)
- 1 unit on 7th transversal (19-21)
Important bet of 40 Units on an unique shot.
We are certain to be beneficial if one of lots of opportunity. And if it's the repetition, we have a net gain of 98 units.