Begin by betting 1 unit on all 12 numbers in your selected group.
For my test, it was all numbers in dozen #1.

If a number wins, you put the secondary bet on that number.
(example, #7 just showed - you now have 1 unit on 11 numbers
and 2 units on #7)
The next step is to remove one of the 1 unit bets.
For my test I went in order from 1 to 12 - so in this case I would
remove #1's bet because it hasn't shown up yet this session.
So... the bets will look as such -

More spins and #11 shows.
2 units now on #11 and remove any 1 of the 1 unit bets from the layout :

More spins and #6 shows, add 1 unit to it and remove any 1 of the
1 unit bets from the layout :

More spins and #11 shows again. It already has 2 units on it - nothing to
add. Simply remove any 1 of the 1 unit bets from the layout :

More spins and #6 shows again - So again, nothing to add -
simply remove any 1 of the 1 unit bets from the layout :

More spins and #3 shows.
Now - we made a bad "choice"/"luck"/"guess" because one of the
numbers that we removed has shown up.
This is handled the same way basically - except you put 2 units on the
number, and then remove any1 of the 1 unit bets.
(So it appears like we are fixing the mistake of a bad guess) :)

More spins and #4 shows - again, same as above - one of the #s that
we removed has shown up. Same procedure of course. 2 units on this
number and remove any 1 of the 1 unit bets from the layout.

More spins and #1 shows up - same procedure. Put 2 units on #1
and remove any of the 1 unit bets from the layout.

More spins and #2 shows up - same procedure.
Put 2 units on #2 and remove a 1 unit bet from the layout.

Now the session is complete !
Because there are no 1 unit bets left on the table.
We "guessed" by removing the numbers that had not shown up
and in this session did pretty bad - worse than normal even.
Some of the numbers that we removed actually did show up - and
not many of the 2 unit numbers repeated.
But not a bad session in the bankroll department either.
+16 units even though the results as far as winning spins were not
that good.


You can imagine what happens when we remove numbers and they
do not show up, and the 2 unit numbers hit repeatedly, which happens
as well. Hundreds of units in one session is possible.
This is what happens with the progression factored into the mix.