betting poker

Players in a poker game act in turn, in clockwise rotation (acting out of turn can negatively affect other players). When it is a player's turn to act, the first verbal declaration or action he takes binds him to his choice of action; this rule prevents a player from changing his action after seeing how other players react to his initial action.
A player may fold by surrendering his cards (some games may have specific rules regarding how to fold--for example, in stud poker one must turn one's upcards face down). A player may check by tapping the table or making any similar motion. All other bets are made by placing chips in front of the player, but not directly into the pot ("splashing the pot" prevents other players from verifying the bet amount).
The act of making the first voluntary bet in a betting round is called opening the round. On the first betting round, it is also called opening the pot. Some poker variations have special rules about opening a round that may not apply to other bets. For example, a game may have a betting structure that specifies different allowable amounts for opening than for other bets, or may require a player to hold certain cards to open.
To call is to match a bet or a raise. A betting round ends when all active players have bet an equal amount or no opponents call a player's bet or raise. If no opponents call a player's bet or raise, the player wins the pot.
The second and subsequent calls of a particular bet amount are sometimes called overcalls. A player calling a raise before he or she has invested money in the pot in that round is cold calling. For example, if in a betting round, Alice bets, Bob raises, and Carol calls, Carol "calls two bets cold". A player calling instead of raising with a strong hand is smooth calling, a form of slow play.
In public card rooms and casinos where verbal declarations are binding, the word "call" is such a declaration. In public cardrooms, the practice of saying "I call, and raise $100" is considered a string raise and is not allowed. Saying "I call" commits you to the action of calling, and only calling.
Note that the verb "see" can often be used instead of "call": "Bob saw Carol's bet", although the latter can also be used with the bettor as the object: "I'll see you" means 'I will call your bet'. However, terms such as "overseeing" and "cold seeing" are not valid.
If no one has yet opened the betting round, a player may check, which is equivalent to calling the current bet of zero. When checking, a player declines making a bet; indicating that he does not choose to open, but that he wishes to keep his cards and retain the right to call or raise later in the same round if an opponent opens. In games played with blinds, players may not check on the opening round because they must either match (or raise) the big blind or fold. A player with a live big blind who chooses not to exercise his right to raise is said to check his option. If all players check, the betting round is over. A common way to signify checking is to tap the table with a fist or an open hand.
To raise is to increase the size of the bet required to stay in the pot, forcing all subsequent players to call the new amount. If the current bet amount is nothing, this action is considered the opening bet. A player making the second (not counting the open) or subsequent raise of a betting round is said to re-raise.
Standard 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 may raise by another $5 (or more), but he may not raise by only $2. The primary purpose of the minimum raise rule is to avoid game delays caused by "nuisance" raises (small raises of large bets that have little effect on the action but take time). 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 his entire remaining stake.
In most casinos, fixed-limit and spread-limit games cap the total number of raises allowed in a single betting round (typically three or four, not including the opening bet of a round). For example in a casino with a three-raise rule, if one player opens the betting for $5, the next raises by $5 making it $10, a third player raises another $5, and a fourth player raises $5 again making the current bet $20, the betting is said to be capped at that point, and no further raises beyond the $20 level will be allowed on that round. It is common to suspend this rule when there are only two players betting in the round (called being heads-up), since either player can call the last raise if they wish. Pot-limit and no-limit games do not have a limit on the number of raises.
After a player raises an amount, the remaining players in the hand must match the raise or fold.
To fold is to discard one's hand and forfeit interest in the current pot. Folding may be indicated verbally or by discarding one's hand face down into the pile of other discards called the muck. In stud poker played in the United States, it is customary to signal folding by turning all of one's cards face down. In casinos in the United Kingdom, a player folds by giving his hand as is to the "house" dealer, who will spread the hand's upcards for the other players to see before mucking them.
It is a serious breach of etiquette to fold out of turn, that is, when it is not the folding player's turn to act, because this can harm other players. For example, if there are three players remaining and the first player in turn bets, the third player folding out of turn gives valuable strategic information to the second player (who is in turn at this point), to the detriment of the bettor. In some games, even folding in turn when a player is entitled to check (because there is no bet facing the player) is considered an out of turn fold since it gives away information to which other players would otherwise not be entitled. Finally, if a player folds out of turn in a stud poker game, the player in turn may demand that his upcards remain exposed until he has completed his turn. When folding, concealed cards should not be exposed unless no further betting is possible in the hand (i.e., unless the fold awards the pot to the only remaining player). A player is never required to expose his concealed cards when folding prior to the showdown.
All poker games require some forced bets in order to create an initial stake for the players to contest. The requirements for forced bets, and the betting limits of the game (see below) are collectively called the game's betting structure.
An ante is a forced bet in which each player places an equal amount of money or chips into the pot before the deal begins. In games where the acting dealer changes each turn, it is not uncommon for the players to agree that the dealer provides the ante for each player. This simplifies betting, but causes minor inequities if other players come and go or miss their turn to deal.
A blind or blind bet is a forced bet placed into the pot by one or more players before the deal begins, in a way that simulates bets made during play. The most common use of blinds as a betting structure calls for two blinds: the player after the dealer blinds about half of what would be a normal bet, and the next player blinds what would be a whole bet. Sometimes only one blind is used, and sometimes three. In the case of three blinds (usually one quarter, one quarter, and half a normal bet amount), the first blind goes "on the button", that is, is paid by the dealer.
For example, in a $2-$4 limit game, the first player to the dealer's left (who, if not for the blinds, would be the first to act) makes a blind bet of $1, and the next player in turn posts a big blind of $2. After the cards are dealt, play begins with the next player in turn (third from the dealer), who must either call $2, raise, or fold. When the betting returns to the player who blinded $1, he must equal the bet facing him (toward which he may count his $1), raise, or fold. If there have been no raises when action first gets to the big blind (that is, the bet amount facing him is just the amount of the big blind he posted), the big blind has the option to raise or check. This right to raise (called the option) occurs only once: if his raise is now called by every player, the first betting round closes as usual. In some fixed-limit and spread-limit games, the big blind amount may be less than the normal betting minimum. Players acting after a sub-minimum blind have the right to call the blind as it is, even though it is less than the amount they would be required to bet, or they may raise the amount needed to bring the current bet up to the normal minimum, called completing the bet. For example, a game with a $5 fixed bet on the first round might have blinds of $1 and $2. Players acting after the blind may either call the $2, or raise to $5. After the bet is raised to $5, the next raise must be to $10 in accordance with the normal limits.