I'm having a draw on this, purely on the fact that I don't like backing anything or anyone on 6 time winning streaks but I can't see Ferencvarosi being strong enough to win. Unscientific, unmathematical but it's how I roll sometimes!
Instead of Martingale, ever consider following a fibbonacci betting sequence ?
Definitely worth a punt on the Draw @4.50 given that Ferenc haven't lost in a bit. They're going to set themselves up to frustrate Zagreb rather than play for a win if their previous away games are anything to go by.
I never did fibo with sports betting but i had a Martingale forex bot a couple of years back. Was a consistent earner although not much because you can't scale that thing up without taking on too much risk.
Unscientific and unmathematical calls it again!