Blackjack

This American Life explores blackjack's unique allure: unlike most casino games, it offers near-even odds if played correctly, fueling the dream that a system could beat the house. The episode traces people chasing that dream through card counting—a legal math-based edge—and reveals its practical limits, moral tensions, and the casinos' counter-strategies targeting vulnerable players.

How Card Counting Works

Card counting tracks the ratio of high cards (tens and aces, good for players) to low cards remaining in the deck. Andy Block, a former MIT Blackjack Team member who helped win millions from 1994-2000, taught producers Ira Glass and Robin Semion the "Hi-Lo" system: start at zero, add one for low cards (2-6), subtract one for high cards (10-ace), ignore 7-9. A high "running count" (e.g., +7 or more, adjusted for decks left) signals player advantage; bet big then, up to five times normal. No genius required—just focus. Pros switch tables for positive counts and use "basic strategy" deviations, like splitting tens against a dealer 6 when high cards abound. Casinos counter by shuffling early, "backing off" suspects, or banning them, though it's not illegal or against rules.