The chances of getting winning combinations. 40,000:1 is a chance of getting a Royal Flush. 10,000:1 is a chance of getting a Straight Flush. Only one of 423 combinations can be a Four of a Kind. Only one of 86 combinations can be a Full House. 93:1 is a chance of getting a Flush. The chance of getting Straight is 85:1. 13:1 is a chance of getting a Three of a Kind. The chance of getting Two Pairs is 8:1. The chance of getting High Pair is 5:1. Internet Straight Poker Software.