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. Only one of 423 combinations can be a Four of a Kind. Only one of 86 combinations can be a Full House. Only one of 93 combinations can be a Flush. Only one of 85 combinations can be a Straight. The chance of getting Three of a Kind is 13:1. 8:1 is a chance of getting a Two Pairs. The chance of getting High Pair is 5:1. Multi-Hand Straight Poker Tips.