Well now, This is a 1 dozen bet... I tried to figure out systems that doesn't have so great drawdowns, and this may be one of those. I haven't gone beyond -200u so far playing with 5u bets, I keep a low wingoal with a relative large bankroll for this kind of bet.
Trigger: a NEW dozen hit. When a new dozen hit, put 1u on that particular dozen.
Progression: double bets after 2 spins, until hit. (this progression is not perfect, but perfect enough for this purpose)
Bankroll: (stoploss)
a minimum of 100u playing with 1u bets,
a minimum of 500u playing with 5u bets.
a minimum of 2500u playing with 25u bets.
Wingoal: +20%
+20u playing with 1u bet,
+100u playing with 5u bets,
+500u playing with 25u bets etc..
(first tests was played with 5u bets)
5/5 Games won
9/10 Games won
Calculating wins/losses:
losses 1*500= -500u
wins 9*100= +900u
Total= +400u