Different rules will come into play depending on the game you are participating in, but as a general rule you should always remember the following:

Gamblers Anonymous is a treatment program and support for compulsive gamblers.  Compulsive gamblers are not only those who gamble frequently, but those who go on ocassional gambling binges.  To understand whether you or a loved one needs to join their local Gambler’s Anonyomous group, you must realize that you can become addicted to the adrenline rush that you get from winning, as you can become addicted to alcohol, or the high on drugs.  The same way which you require more alcohol or drugs to induce the same high you used to get in the beginning is the same way that you must increase your bets or your frequency, to get the same rush from gambling.