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