wait for a particular dozen to stay dormant 5 spins.
Bet that dozen on the 6th spin and keep going until you win
use this progression:
1 2 3 4 6 9 14 21 31
how often does a dozen stay dormant 14 spins, very rarely
may be better for columns....wait for a column to be dormant 5 times
I've had dozen's and column's stay dormant for at least 30 spin's in the past
I seen a dozen take 34 spins on rng and 33 on smart live, and close to these a few times, so you need to make a lot of money to stay in profit