Track the 3 even chances.
R/B
O/E
H/L
All we need is 2 out of the 3 and a profit is made.
We play follow the last, so if 8 appears, we will play BEL
13 spins. We win 2 out of 3 (black and low)
Retrack, keep prog flat, all is good.
Now if you lose 2 out of 3, you raise your next stake to 2. If you lose 3 out of 3, then you raise your next stake by 3. That simple. So, lets check a trickier run:
32... Bet REH
8...lost 2/3 ...-1 ...next bet 2u
21...lost 3/3...-7 ...next bet 3 + 2 =5u
17...win 2/3 ...-2
This keeps the occasional tough run to a manageable limit for when you get a nice little session.
BW