This instant poker odds calculator tells your immediate odds of winning or losing in Open ended straight flush draw, Straight/Flush/Pair, 21, %, %. Pot odds can be a little bit tricky. Almost everyone knows that a flopped flush draw is about to hit, meaning they need better than odds to play the hand. Poker odds #3: How to play a flush draw. In the third part of the Paul Phua Poker School series on poker odds, Paul Phua gives tips on flush.