Definition of capé
What is meant by capped is that the possible hand or range of a given opponent is capped at a maximum strength. This deduction will be made according to the information obtained on the previous streets. Are you a bit confused? Nothing better than an example. You are on the button and open A2. The player in the small blind calls. You play your hand to the river and the board is A-A-K-Q-2. Your opponent passes and you bet. To your surprise, he pushes all in. What hand does he have? Are you beat? Answer: No, because his hand is capped.
By capped, we mean that logically our opponent does not have all the hands in his range. When you raised preflop, if he had AK or AQ, he would have made a 3bet, which he did not. So when he pushes all in on the river, your chances of being dominated are minimal because your opponent's range is captured. He may have a hand like A5 overplayed or a hand like JT overplayed. He may also have a strange 22 for a small full hand. It's very important to realize when your opponent's range is capped because it prevents you from making disastrous folds and encourages you to make good bluffs.