Trigger: wait until one particular dozen has been hit three times (three different numbers); bet the remaining 9 unhit numbers with nine numbers negative progression 1,1,1,2,2,3,4,5,6,9,13,17.
tested and worked fine so far on Eurogrand and Betvoyager.
result better than expected at betvoyager +400u playing with 1u bets...
first test