OK, this is played with 27 numbers, still it's a 50/50 percent chance of winning. I'm not saying it will work all of the time, things can go to hell sometimes, but with proper moneymanagement it's playable, perhaps?
TRIGGER- IF LOW hits, HIGH is bet, if HIGH hits, LOW is bet. (with streets)-Look at the history of spins, and bet the 3/6 UNHIT streets in HIGH/LOW (depending which side has hit, the opposite side of the current hit is bet) after the 3 streets are bet, also bet 3 units on the opposite HIGH or LOW.
So, for an example let's say number 7 hits--That is LOW. Now look at the history of spins and locate the last 3 streets hit in HIGH These 3 street are NOT bet. The 3 UNHIT streets are bet. Let's say streets 19/21,22/24 and 34/36 was the last 3 streets hit in HIGH. Now bet the remaining 3 unhit streets: 25/27,28/30 and 31/33. Also bet 3u at LOW.
Progression: double for each loss, until win.
First tests was played with 1u bets.
3/3 Games won.
Highest step in progression 1 2 4 8 16 32...was step 6 (32)