Introduction The phrase "juego de cartas para ganar dinero" (card game to earn money) evokes images of professional poker players in Las Vegas, street magicians, or sharp-eyed rummy players in local clubs. While the idea of turning a deck of cards into a source of income is appealing, the reality is nuanced. Some card games are purely gambling (chance-based), while others are skill-based, where a dedicated player can theoretically achieve a long-term positive return.