A straight flush in Three Card Poker is any hand containing three consecutive cards that share the same suit. For example, the lowest straight flush you can make in 3-Card Poker is an Ace, 2, 3 straight. On the other end of this range, the highest straight flush is a King, Queen, Jack hand.
The straight flush hand is the second-best hand you can have in Three Card Poker. It pays 40:1. This is second only to the 200:1 payout you can get if you have a Mini Royal Flush, which is a suited Ace King Queen hand.
As the straight flush is so valuable, the probability of getting this hand is very low, about 0.22%. But, to put it in a more optimistic perspective, there are 48 possible combinations that can produce a straight flush in Three Card Poker.