Labouchere - Played on even chances this is a cancelation system of bets and is bet in units Example:
Step 1 write a line of numbers ie 1 2 3 4 5 6 with the
target of crossing out all numbers
Step 2 Add up the 2 outer numbers and this totals your bet
in units ie 1+6 =7 units on red.
Step 3 If the bet wins cross out the 2 out numbers and repeat
step 2 do this until all numbers are crossed out
Step 4 If the bet loses add the number of units
bet to end of the row of numbers an repeat step 2