Helena
The 136 spin test
At spin 9 -36, if you rebet the last 8 and double the bet, spin 10 is #6, so -52, rebet the last 8 for 16 again spin 11 is #6,so 68 units in total return 72, +4.
Now start with last # for 1 unit, if you carried on this way of betting at spin 21 +42.
That is using a progression, this is all about flat betting.