This is a doubledozen strategy.
For dozens there can only be three possible movements:
(1) Repeat
(2) Last dozen hit
(3) New dozen hit
Trigger: wait until one pattern repeats 3 times, then start betting against that particular pattern with a doubledozen progression 1-3-9-27.
so for an example:
dozen 1 repeat 3 times (pattern 1): numbers 3,6,4,9 hits (This is a valid trigger) now start betting dozen 2 & 3.
pattern 2: repeat between two dozens: (dozen 1 & 3): 2,26,7,33,8 hits (This is a valid trigger) now bet dozen 1 & 2 (against a new repeat), next bet would be, if dozen 3 would hit again; dozen 2 & 3, and so on...
pattern 3: new dozen hit, dozen 1,2,3,1,2 hits.(this is a valid trigger) Now bet against a new dozen to hit, in this case the bet would be dozen 1 & 2, if dozen 3 would hit the new bet would be 3 & 2 and so on...
I haven't lost ONE trigger so far playing this, why? It's very unlikley a dozen pattern would repeat more than 7-8 times...