In blackjack, this is an illegal move where the player attempts to increase their bet after seeing that they are likely to win, thereby maximizing their profits unfairly. Casinos have strict surveillance systems to prevent capping a bet, and those caught engaging in this behavior can face serious consequences, including being banned or prosecuted.
Capping a Bet Example
For example, a player places a $50 bet at the start of a blackjack round. After being dealt a strong hand, they secretly place additional chips on their stack when the dealer is distracted, increasing their bet to $100 without anyone noticing.