Hard to explain this one, but easy once you get it.
This is played with quads. Bet only when column 1 or 3 is hits;
In each dozen hit two quads are placed in a certain order;
when one quad is hit, both quads are removed in that particular dozen.
Flatbet.
example; (gameplay)
number 4 hits: two quads are placed 2/6 & 7/11
number 22 hits: two quads are placed 13/17 & 20/24
number 36 hits: quads are placed 26/30 & 31/35
number 13 hits... both quads are removed 13/17 & 20/24
number 6 hits...both quads are removed 2/6 & 7/11
number 20 hits; no bet
number 24 hits: quads are placed 14/18 & 19/23
number 14 hits: both quads are removed 14/18 & 19/23
number 36 hits; no bet
number 1 hits: quads are placed 2/6 & 7/11
number 15 hits: quads are placed 13/17 & 20/ 24
number 21 hits: quads are removed 13/17 & 20/ 24
number 23 hits: (no bet... column 2)
I've tested this system today playing on Dublinbet with success...(i don't have access to rx)