This is a static bet, with a mild progression. Reason why it works? A group of numbers can't be cold forever; Numbers become cold, then they become hot again, in a cycle like that. When a group of numbers become hot again for a short period of time, that's enough to make profit.
Pick and bet one of these groups (9 numbers)
RED HIGH
RED LOW
BLACK HIGH
BLACK LOW
Now check bankroll. IF no profit, no loss, no change of bets,
For each hit check bankroll: -IF not a new high is reached, +1u bet for each hit, until recovered. (until a new high is reached, then Reset to 1u bet again).
First test was played with 1u bets.