The chances of getting winning combinations. The chance of getting Royal Flush is 40,000:1. 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. The chance of getting Flush is 93:1. The chance of getting Straight is 85:1. The chance of getting Three of a Kind is 13:1. The chance of getting Two Pairs is 8:1. The chance of getting High Pair is 5:1. Computer Poker Game Straight Flush.