In a poker game, a “cap game” is one in which there is a limit on the number of bets or raises that a player can make in a single betting round.
The cap is usually set at a relatively low number, such as three or four, to prevent the pot from growing too large and to encourage more action and betting. Once the cap is reached, no more bets or raises can be made for that round, and the remaining players go to a showdown to determine the winner of the pot. Cap games are most commonly found in limit poker, but they can also be used in other variations of the game.