Lowball is draw poker with the lowest hand winning the pot. Each player is dealt five cards facedown, after which there is a betting round. Players are required to open with a bet or fold. The players who remain in the pot after the first betting round now have an option to improve their hand by replacing cards in their hands with new ones. This is the draw. The game is normally played with one or more blinds, sometimes with an ante added. Some betting structures allow the big blind to be called; other structures require the minimum open to be double the big blind. In limit poker, the usual structure has the limit double after the draw (Northern California is an exception). The most popular forms of lowball are ace-to-five lowball (also known as California lowball), and deuce-to-seven lowball (also known as Kansas City lowball). Ace-to-five lowball gets its name because the best hand at that form is 5-4-3-2-A. Deuce-to-seven lowball gets its name because the best hand at that form is 7-5-4-3-2 (not of the same suit). For a further description of the forms of lowball, please see the individual section for each game. All rules governing kill pots are listed in Section 13 - Kill Pots.
Roberts Rules of Poker