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