the second (not counting the open) or subsequent raise of a betting round is said to re-raise. A player making a raise after previously checking in the same betting round is said to check-raise. The sum of the opening bet and all raises is the amount that all players in the hand must call in order to remain eligible to win the pot, subject to the table stakes rules described in the previous paragraph. A bluff is when a player bets or raises when it is likely they do not have the best hand; it is often done in hopes that (an) opponent(s) will fold mediocre yet stronger hands. When a player bets or raises with a weak hand that has a chance of improvement on a later betting round, the bet or raise is classified as a semi-bluff. On the other hand, a bet made by a player who hopes or expects to be called by weaker hands is classified as a value bet. In no-limit and pot-limit games, there is a minimum amount that is required to be bet in order to open the action. In games with blinds, this amount is usually the amount of the big blind. Modern poker rules require that raises must be at least equal to the amount of the previous bet or raise. For example, if an opponent bets $5, a player must raise by at least another $5, and they may not raise by only $2. If a player raises a bet of $5 by $7 (for a total of $12), the next re-raise would have to be by at least another $7 (the previous raise) more than the $12 (for a total of at least $19). The primary purpose of the minimum raise rule is to avoid game delays caused by "nuisance" raises (small raises of large bets, such as an extra $1 over a current bet of $50, that have little effect on the action but take time as all others must call). This rule is overridden by table stakes rules, so that a player may in fact raise a $5 bet by $2 if that $2 is their entire remaining stake. In no-limit and pot-limit games, if a player opens action in a betting round by placing any number of chips in the pot without a verbal declaration, or if they place two or more chips in the