This is not the grail, but perhaps a short-term grail? Atleast it probably one of my best Flatbet-systems, so far. With a 80% winrate, initial tests looks good.
All credits to Mr.J
Procedure: Bet the two last hit numbers for 18 spins, Then stop. IF hit re-start with the two current last numbers hit. IF no hit. restart with the two current last numbers hit.
wingoal/stoploss +500/-500
(First test played with 5u bets)
8/10 Games won
more spins...
14/20 Games won, That's about a 70% winrate,
Why not play always the last 2 numbers of the same dozen and color flatbet?