The chances of getting winning combinations. Only one of 40,000 combinations can be a Royal Flush. Only one of 10,000 combinations can be a Straight Flush. The chance of getting Four of a Kind is 423:1. 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. Only one of 8 combinations can be a Two Pairs. 5:1 is a chance of getting a High Pair. Internet Straight Poker Strategy.