Poker probability The "nCr" function on most scientific calculators can be used to calculate hand frequencies; entering with and , for example, yields formula_2 as above. The royal flush is a case of the straight flush. It can be formed 4 ways (one for each suit), giving it a probability of 0.000154% and odds of 649,739 : 1. When ace-low straights and ace-low straight flushes are not counted, the probabilities of each are reduced: straights and straight flushes each become 9/10 as common as they otherwise would be. The 4 missed straight flushes become flushes and the 1,020 missed straights become no
Four flush Four flush A four flush (also flush draw) is a poker hand that is one card short of being a full flush. Four flushing refers to empty boasting or unsuccessful bluffing, and a four flusher is a person who makes empty boasts or bluffs when holding a four flush. Four flusher can also refer to a welcher, piker, or braggart. This pejorative term originated in the 19th century when bluffing poker players misrepresented that they had a flush—a poker hand with five cards all of one suit—when they only had four cards of one suit. Optimal strategies for bluffing or