Martingale
A betting system where the bettor doubles the stake after each loss, aiming to recover all losses and win a profit equal to the original stake when a win eventually occurs. This strategy assumes an infinite bankroll (or table limits not reached), which in reality makes it very risky.
Using a **martingale** on coin flips: bet \$10 and lose, then bet \$20 and lose, then bet \$40 and win. That \$40 win returns \$80 (profit \$40), which covers the \$10+\$20+\$40 = \$70 in total losses from prior bets and nets \$10 profit (equal to the original stake). In boxing betting, this might mean increasing your bet on each successive fight until you win – a dangerous approach if a long losing streak occurs.