<P> A straight flush is a poker hand containing five cards of sequential rank, all of the same suit, such as Q ♥ J ♥ 10 ♥ 9 ♥ 8 ♥ (a "queen - high straight flush"). It ranks below five of a kind and above four of a kind . As part of a straight flush, an ace can rank either above a king or below a two, depending on the rules of the game . Under high rules, an ace can rank either high (e.g. A ♥ K ♥ Q ♥ J ♥ 10 ♥ is an ace - high straight flush) or low (e.g. 5 4 3 2 A is a five - high straight flush), but cannot rank both high and low in the same hand (e.g. Q ♣ K ♣ A ♣ 2 ♣ 3 ♣ is an ace - high flush, not a straight flush). Under deuce - to - seven low rules, aces can only rank high, so a hand such as 5 ♠ 4 ♠ 3 ♠ 2 ♠ A ♠ is actually an ace - high flush . Under ace - to - six low rules, aces can only rank low, so a hand such as A ♥ K ♥ Q ♥ J ♥ 10 ♥ is actually a king - high flush . Under ace - to - five low rules, straight flushes are not recognized, and a hand that would be categorized as a straight flush is instead a high card hand . </P> <P> There are 40 possible straight flush hands and 10 distinct ranks of straight flush under high rules when using a standard 52 - card deck . Each straight flush is ranked by the rank of its highest - ranking card . For example, 10 ♣ 9 ♣ 8 ♣ 7 ♣ 6 ♣ ranks higher than 8 ♥ 7 ♥ 6 ♥ 5 ♥ 4 ♥, which ranks higher than 6 ♠ 5 ♠ 4 ♠ 3 ♠ 2 ♠ . Straight flush hands that differ by suit alone, such as 7 6 5 4 3 and 7 ♠ 6 ♠ 5 ♠ 4 ♠ 3 ♠, are of equal rank . </P> <P> An ace - high straight flush, such as A K Q J 10, is commonly known as a royal flush or royal straight flush and is the best possible hand in high games when not using wild cards . A five - high straight flush, such as 5 ♥ 4 ♥ 3 ♥ 2 ♥ A ♥, is called a steel wheel and is significant in ace - to - five high - low split games for being both the best low hand and usually the best high hand of the showdown . </P> <P> Four of a kind, also known as quads, is a poker hand containing four cards of the same rank and one card of another rank (the kicker), such as 9 ♣ 9 ♠ 9 9 ♥ J ♥ ("four of a kind, nines"). It ranks below a straight flush and above a full house . </P>

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