I wrote about this before and test different options - finally i come to one simple conclusion.
Play same or follow the flow is the very best option for even money bets - my opinion.
It has a very high strike ratio and every winning sequence end with three loses.
If some one would play this for real money - then i would recommend a fibo progression where the next bet recoup the two previous.
Some one can apply the principal of 1/3 and chart the outcomes as pattern of three.
Or some one can just use a straight forward line.
You play the same as the previous three outcomes witch make it 7 in 8 to win with three attempts.
The trigger is to play after a win after that one previous three lost.
sounds interesting... can you give a sample?