Wikipedia: Poker/Betting structure

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The game of poker as played today requires that players agree before play on a betting struture, which is a set of rules that determine what each player is allowed to bet or forced to bet in every game situation. The term includes the amounts and rules of all forced bets (see Poker/Game play) and betting limits, which determine what bets may be made during play.

The game of poker as played today requires that players agree before play on allowable amounts for betting (called limits), and the use and amount of forced bets. These are collectively called the betting structure of the game.

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Forced bets

* Antes: Every player places an equal (typically small) amount into the pot before the deal begins. In a home game where the right to act as dealer rotates, it is not uncommon for the players to agree that the dealer must ante for everyone in his turn. This simplifies betting, but causes minor inequities if other players come and go or miss their turn to deal.

* Blinds: One or more players after the dealer in order open the betting before receiving their cards, but in the same manner as if they were opening the betting after the deal. For example, the first player to the dealer's left blinds $1, and the next player blinds $2. After the cards are dealt for the first round, betting continues with the third player to the dealer's left, who must call the $2 bet, raise, or fold, exactly as if that bet had been made during play rather than before. When the betting returns to the player who blinded $1, he acts just as if that had been the initial bet; he must equal the bet facing him (toward which he may count his $1), fold, or raise. An additional privilege is given to the player who posted the $2 big blind: if there have been no raises by the time his first real turn to bet comes (that is, the bet amount facing him is just the $2 he originally put in), then he has the right to raise at that point, even though his right-hand opponent's call would normally have closed the betting round under other circumstances. This "extra" right to raise (called a "live" blind) occurs only once: if his raise is now called by every player, the first betting round closes.

* Bring-ins: This actually occurs after the cards are initially dealt, but before any other action. One player, usually chosen by the value of cards dealt face up on the initial deal, is forced to open the betting by some token amount, after which players act after him in normal rotation.

Home games typically use a small ante only. Casino games typically use blinds for draw and community card games, and an ante plus bring-in for stud games (very small limit stud games may omit the ante). A good balance is for the total of all forced bets to equal one or two times the betting limit for a game. For example, if eight players play a game with a $2 betting limit, a $.25 or $.50 ante would make a well-balanced game, as would a game with $1 and $2 blinds, or a $.25 ante and $1 bring-in.

Forced bets come in three forms: /Antes, /Blinds, and /Bring-ins. Home games typically use a small ante only. Casino games typically use blinds for draw poker and community card poker games, and an ante plus bring-in for stud poker games (very small limit stud games may even omit the ante). A good balance is for the total of all forced bets to equal one or two times the betting limit for a game. For example, if eight players play a game with a $2 betting limit, a $.25 or $.50 ante would make a well-balanced game, as would a game with $1 and $2 blinds, or a $.25 ante and $1 bring-in.

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Betting limit types

* No limit: Any player may bet all of his stake at any time (subject to the table stakes and equal raise rules below).

* Pot Limit A player may raise up to an amount equal to the size of the whole pot before the raise. For example, let's assume that there is $10 in the pot at the start of a betting round. The first player may open the betting for up to $10. If he does in fact open for $10, the next player may raise to $40 (after calling the $10 bet, the total amount of the pot is $30, so he may raise $30).

* Fixed limit: The player never chooses the amount bet, only whether to bet or not, and the amount is fixed by rule. Commonly later betting rounds specify higher bets than earlier rounds; for example a four-round game called "2 and 4 limit" may specify that all bets on the first two rounds are $2, and on the third and fourth round $4. This amount applies to each raise, not the total amount bet in a round, so a player may bet $2, be raised $2, and then reraise another $2, for a total bet of $6, in such a game.

* Spread Limit: The player make raise any amount within a specified range. For example, a game called "1 to 5 limit" allows each bet to be anywhere from $1 to $5 (subject to the rules below). These also are typically larger in later rounds of multi-round games.

All such games have a minimum bet as well as the stated maximums, and also commonly a betting unit, which is the smallest denomination in which bets can be made. For example, it is common for a games with $20 and $40 betting limits to have a minimum betting unit of $5, so that all bets must be in multiples of $5, to simplify game play. It is also common for some games to have a bring-in that is less than the minimum for other bets. In this case, players may either call the bring-in, or raise to the full amount of a normal bet, called completing the bet.

Outside of the United States, pot limit and no limit games are the most common. Most American home games are played with a spread limit, while casino games are played with spread or fixed limits, though larger casinos may have a high-stakes pot limit or no limit game as well. Fixed limit and spread-limit games emphasise the skill of estimating odds, and are more influenced by chance. Pot limit and no limit games emphasis the skills of game threory and psychology, and are far less influenced by chance.

Equal raise rule

A universal rule in American casinos, and common in home games as well, is that any raise must at least equal the amount of the previous raise. For example, if a player in a spread limit or no limit game bets $5, the next player may raise by another $5 or more, but he may not raise by only $2, even if that would otherwise conform to the game's structure. The primary purpose of this rule is to avoid game delays caused by "nuisance" raises (small raises of large bets that don't affect the bet amount much but that take time). This rule is often overridden by table stakes rules (see below), so that a player may in fact raise a $5 bet by $2 if that $2 is his entire remaining stake.

Raise caps

In many casinos, there is a limit to the total number of raises allowed in a single betting round (typically 3 or 4, not including the opening bet of a round). For example in a casino with a 3-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 head up).

Table stakes rules

All casinos and many home games play by what are called table stakes rules, which state that each player starts each deal with a certain stake, and plays that deal with that stake. He may not remove money from the table or add money from his pocket during the play of a hand. This requires some special rules to handle the case when a player is faced with a bet that he cannot call with his available stake. A player also may not hide the amount of his stake from other players, and must disclose the amount when asked.

When a player is faced with a current bet amount that he has insufficient remaining stake to call, and he wishes to call (he may of course fold without the need of special rules), he bets the remainder of his stake and declares himself all in. He may now hold onto his cards for the remainder of the deal as if he had called every bet, but he may not win any more money from any player above the amount of his bet. For example, let's assume that the first player in a betting round opens for $20, and the next player to bet only has $5 remaining of his stake. He bets the $5, declaring himself all in, and holds onto his cards. The next player in turn still has the $20 bet facing him, and if he can cover it he must call $20 or fold. If he calls $20, thus ending the betting round, instead of collecting all bets into the central pot as usual, the following procedure is applied: since there is an all in player with only $5 bet, his $5, and $5 from each of the other players, is collected into the central pot, now called the main pot, as if the final bet had been only $5. This main pot (which may include any antes or bets from pervious rounds) is the most the all in player is eligible to win. The remaining money from the still-active bettors, in this case $15 apiece, is collected into a side pot that only the players who contributed to it are eligible to win. If there are further betting rounds, all bets are placed into the side pot while the all in player continues to hold his cards but does not participate in further betting. Upon the showdown, the players eligible for the side pot--and only those players--reveal their hands, and the winner among them takes the side pot, regardless of what the all in player holds (indeed, before he even shows). After the side pot is awarded, the all in player then shows his hand, and if it is superior to all others shown, he wins the main pot (otherwise he loses as usual).

There is a strategic advantage to being all in: you cannot be bluffed, because you are entitled to hold your cards and win the pot without risking any more money. The players who continue to bet after you are all in can still bluff each other out of the side pot, which is also to your advantage since they reduce your competition without risk to you. But these advantages are more than offset by the disadvantage that you cannot win any more money than what your stake can cover. After all, the object of poker is not to win hands--it is to win money.

If a player goes all in with a raise rather than a call, another special rule comes into play. There are two options in common use here: pot limit and no limit games always use what is called the full bet rule, while smaller fixed or spread limit games use either the full bet rule or the half bet rule. The full bet rule states that if the amount of an all in raise does not equal the full amount of the previous raise, it does not consitute a "real" raise, and therefore does not reopen the betting action. The half bet rule states that if an all in raise is equal to or larger than half the bet being raised, it does constitute a raise and reopens the action. For example, a player opens the betting round for $20, and the next player has a total stake of $25. He may raise to $25, declaring himself all in, but this doesn't consitute a "real" raise, in the following sense: if a third player now calls the $25, and the first player's turn to act comes up, he must now call the additional $5, but he does not have the right to reraise further. The all in player's pseudo-raise was really just a call with some extra money, and the third player's call was just a call, so the initial opener's bet was simply called by both remaining players, closing the betting round (even though he must still equalize the money by putting in the additional $5). If the half bet rule were being used, and the all in player had raised to $30 instead of $25, then that raise would count as a genuine raise and the first player would be entitled to reraise if he chose to (this would create a side pot for the amount of his reraise and the third player's call, if any).

Because these rules are complicated (especially when more than one player goes all in, or there are pots to be split because of ties), informal home games often allow players to temporarily borrow money to add to their stake during a hand when necessary, which is called going light.

Betting limits apply to the amount a player may /Open or /Raise, and come in four common forms: /No limit, /Pot limit (the two collectively called big bet poker), /Fixed limit, and /Spread limit.

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