A Single Draw from 2 to 7 (Kansas-City Lowball) is a variation of draw-poker with an exchange. In this game, the players must collect the weakest combination in order to win. Poker combinations in this game are different from ones that are used in Hold'em or Omaha.
In the single draw straights and flushes are considered to be losing combinations, as well the Ace in this game is considered as a high card, unlike Stud or Badugi. Hence, in order to collect the strongest combination, your hand must consist of 5 unpaired and unsuited cards.
In Lowball the game is played with blinds, and sometimes ante can be used which is 1/10 of the big blind.
Each of the players at the table gets 5 cards facedown on their hands. Then a betting round follows, the first word belongs to the player who sits to the left of a big blind. In the betting round the players can play call, raise or fold.
Players who have stayed in the hand after the first betting round can improve their hand by exchanging one or more cards and get the new ones from the deck.
The sequence of actions in the 2-7 Single Draw:
Top 10 strongest combinations in 2-7 Single Draw (suits are given as an example):
As you can see, most cards which are considered to be strong in common types of poker (for example, in Hold'em) are weak in a single draw. Sets and pairs, straights and flushes are not taken into account in lowball, these are the losing combinations. If both opponents don’t have flushes and straights, the winner is determined by the highest card. For example, a hand of 8 7 5 4 2 beats the combination of 9 6 4 3 2.
There is also a kind of 2-7 single draw, which is called 2-7 Triple Draw. The main differences of this type are increasing the possibility of the cards exchange (from 1 in a single draw to three in a triple draw) and four betting rounds instead of two. The rules and the power of combinations remain the same as in single draw.
The sequence of actions in 2-7 Triple Draw:
On the showdown, the player with the best low-combination wins as in a single draw. If the players have collected identical low-combinations, the pot will be split equally.