$1 AND $2 BETS

Supposing you were playing roulette and made even-money bets on Red. Your starting bankroll is 40 dollars. You can't hope to get ahead if you wager $1 each time and collect after every win. As a smart gambler you bet bigger using your winnings, not the money you brought to the table. This is what would happen if you were on a winning streak and you bet-back your winnings plus one dollar from your original stake in each consecutive round:

  1. Round: Bet $1, win $1, and collect $2
  2. Round: Bet $2 plus $1, win $3, and collect $6
  3. Round: Bet $6 plus $1, win $7, and collect $14
  4. Round: Bet $14 plus $1, win $15, and collect $30
  5. Round: Bet $30 plus $1, win $31, and collect $62
  6. Round: Bet $62 plus $1, win $63, and collect $126

Five- or six-round streaks are not uncommon, ss long as you bet only one unit of your own money each round, you won't get into much trouble.