A PRO needs....
apart from the discipline, bla,bla,blah...
A pro needs...in the strict betting sense..

1]BET SELECTION!!!
A bet selection must not select
a LONG STREAKS OF LOSS!!!
The preferable bet selection=if u play them FLATBET,
after 100 spins, just win or lose ONLY  FEW CHIPS.
A bet selection that win huge and then lose huge , a great no-no!

2] PROGRESSION.
With a good BET SELECTION,
then any reasonanble progression will do...
No progression will survive LONG LOSING STREAKS
without huge risk and BR....




THE MILLION DOLLAR QUESTION=
ANY BET BETSELECTION THAT AVOID LONG LOSING STREAK???

Albalaha's posting in his own web,about the VARIANCE topic, is the answer to many head scratching questions.
I wonder how many people take a very serious read, when they stumbled upon the  article...
If only they realized the value......sigh

You can't prevent the attack of variance on any bet or in other words you can't opt any better betselection . You can only try to be least affected when variance is extreme and at last, a wise stop loss saves your soul.