Seven Card Stud High Low
Seven-card stud high-low split is a stud game which is played both high and low. A qualifier of 8-or-better for low applies to all high-low split games (unless a specific posting to the contrary is displayed). This means to win the low half of the pot, a player's hand at the showdown must have five cards of different ranks that are an eight or lower in rank. (An ace is the highest card and also the lowest card.) If there is no qualifying hand for low, the best high hand wins the whole pot. A player may use any five cards to make the best high hand, and the same or any other grouping of five cards to make the best low hand.
Roberts Rules of Poker