Alice and Dianne only have the option of calling or folding; neither can raise. But if Joane completes, either of them could raise. Opening all-in hands When all players in the pot are all-in, or one player is playing alone against opponents who are all all-in, no more betting can take place. Some casinos and many major tournaments require that all players still involved open, or immediately reveal, their hole cards in this case—the dealer will not continue dealing until all hands are flipped up. Likewise, any other cards that would normally be dealt face down, such as the final card in seven-card stud, may be dealt face-up. Such action is automatic in online poker. This rule discourages a form of tournament collusion called "chip dumping", in which one player deliberately loses their chips to another to give that player a greater chance of winning. Open stakes The alternative to table stakes rules is called "open stakes", in which players are allowed to buy more chips during the hand and even to borrow money (often called "going light"). Open stakes are most commonly found in home or private games. In casinos, players are sometimes allowed to buy chips at the table during a hand, but are never allowed to borrow money or use IOUs. Other casinos, depending on protocol for buying chips, prohibit it as it slows gameplay considerably. Open stakes is the older form of stakes rules, and before "all-in" betting became commonplace, a large bankroll meant an unfair advantage; raising the bet beyond what a player could cover in cash gave the player only two options; buy a larger stake (borrowing if necessary) or fold. This is commonly seen in period-piece movies such as Westerns, where a player bets personal possessions or even wagers property against another player's much larger cash bankroll. In modern open-stakes rules, a player may go all in as in table stakes if they so choose, rather than adding to their stake or borrowing. Because it is a strategic advantage to go all in with some hands while being able to add to one's stake with others, such games may strictly enforce a minimum buy-in that is several times the maximum bet (or blinds, in the case of a no-limit or pot-limit game). A player who goes all in and wins a pot that is less than the minimum buy-in may not then add