This is 12 numbers bet, FLATBET.
TRIGGER- Wait for 2 different dozens to hit, now you bet the opposite color for each of those two dozens hit, (12 numbers bet for 3 spins, then STOP).
For an example 5 (doz 1, RED) & 13 (doz 2, BLACK) hits. Now the bet would be all BLACKs in doz 1, and all REDs in doz 2, straight up.
I've won 14/20 games (with 5u bets) wingoal +500u, stoploss -500u), That's a 70% winrate