Red and black at the same time?

Hello I have a question.
Can I set up a strategy for playing roulette where I bet on red and black at the same time in differing values depending on the last 9 rolls?

Hello.
Generally yes. Depending on the special needs.

The function optimize chances calculates the differential bet, if you mean this.
The roulette strategy Differential d’Alembert works with this concept.

Anonymous:

... depending on the last 9 rolls?

This sounds like a tendency concept right? Why exactly 9 rolls?

Paroli:

Why exactly 9 rolls?

Most likely you won't get answer, because that question came from anonymous.

I would say, people don't await some streaks like 9 times even or black.
This is an misunderstanding, because you can't know when very unlikely constellations show up...