Bet each number as they come -up to 6 numbers- (restart if hit)
if no hit, keep those 6 numbers and start a negative progression
1 1 2 2 2 3 3 4 5 6 7 8 10 12 14 17 21 25 30 36 43 52 62 74
as it seems progression don't go far in most cases betting in a string of 6 numbers ...
example please