A straight flush is a hand that contains five cards in sequence, all of the same suit, such as Q♣ J♣ 10♣ 9♣ 8♣(a hand that meets the requirement of both a straight and a flush). Two such hands are compared by their card that is ranked highest. Aces can play low in straights and straight flushes: 5♦ 4♦ 3♦ 2♦ A♦ is a 5-high straight flush, also known as a "steel wheel".[2][3]
An ace high straight flush such as A♦ K♦ Q♦ J♦ 10♦ is known as a royal flush, and is the highest-ranking standard poker hand. It is usually treated as a distinct hand in video poker.
In five-card poker, there are 40 possible straight flushes, including the 4 royal flushes, the probability of being dealt a straight flush is approx 0.0015%.
In seven-card poker such as Texas hold 'em, the frequency of straight flush is 41,584 (4,324 for royal flush and 37,260 for non-royal straight flush), the probability of straight flush is approximately 0.0311% (0.0032% for royal flush and 0.0279% for non-royal straight flush).
Note: This cache was placed in Jonathan Dickinson State Park as part of Cacheapalooza 8, with the permission of Martin Morse, Park Service Specialist. If you park anywhere in JDSP, make sure all your tires are off the road and you are not blocking any gates. Do not speed in park.