No matter how long it takes, you simply cannot lose, the win is guaranteed! When you succeed finally (the black color must come out at any time soon.), you win $8 minus the previous lost bets of $7 ($1 + $2 + $4) and that makes $1 netto at any time you manage to overcome (or close down) the unfavorable series.If you lose again (at any time), double your previous bet once more ($4) etc.,.If you lose, bet again but twice as much, that is $2,.A typical guide for a guaranteed win at Roulette looks as follows: