Roulette, blackjack and table games
Why does a Martingale betting system eventually fail?
Direct answer
Loss streaks, limited bankroll and table limits can prevent the next doubling, while expected losses remain negative.
How to use this answer
This answer is based on the mathematical principle or published rule identified in the source below. If the question involves a live betting market, confirm its settlement definition before applying it to a specific bet.
Separate the game’s mathematical probabilities from the casino’s house procedure. The odds may be calculable even where split, surrender, side-bet or payout policies differ between tables.