Poker round, if one player bets, no opponents choose to "call" (match) the bet, and all opponents instead "fold", the hand ends immediately, the bettor is awarded the pot, no cards are required to be shown, and the next hand begins. This is what makes bluffing possible. Bluffing is a primary feature of poker, one that distinguishes it from other vying games and from other games that make use of poker hand rankings. At the end of the last betting round, if more than one player remains, there is a showdown, in which the players reveal their previously hidden cards and
Cheating in poker IP addresses, this can conveniently and cheaply be done without the likelihood of immediate detection). Such tactics can give cheaters an advantage that is difficult to work against. However, online poker cardrooms keep records of every hand played, and collusion can often be detected by finding any of several detectable patterns (such as folding good hands to a small bet, as it is known that another player has a better hand). Users who frequently sit at the same tables will be flagged by poker rooms and their play will be closely monitored. Often, such users will be warned they have